{"id":7692,"date":"2025-03-25T14:05:49","date_gmt":"2025-03-25T14:05:49","guid":{"rendered":"https:\/\/kocerroxy.com\/?p=7692"},"modified":"2025-08-08T13:00:44","modified_gmt":"2025-08-08T13:00:44","slug":"multiprocessing-for-faster-scraping","status":"publish","type":"post","link":"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/","title":{"rendered":"Multiprocessing for Faster Scraping"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Scraping a website <strong>page by page in a loop<\/strong> feels like waiting in line at the DMV\u2014<strong>slow, inefficient, and painful.<\/strong> You sit there watching your script chug through <strong>one page at a time<\/strong>, while you know deep down it <strong>should<\/strong> be faster. That\u2019s why many people turn to multiprocessing for faster scraping.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What if you could <strong>scrape multiple pages at once<\/strong>, like having <strong>several workers<\/strong> collecting data in parallel? That\u2019s where <strong>multiprocessing<\/strong> comes in. Instead of waiting for one request to finish before starting the next, <strong>you launch multiple scrapers at the same time<\/strong>, cutting your runtime <strong>by 80% or more<\/strong>. Also, the scraping workload is distributed among multiple processes, allowing for parallel execution and <strong><a href=\"https:\/\/www.bardeen.ai\/answers\/how-to-web-scrape-faster?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noreferrer noopener\">efficient utilization of system resources<\/a><\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-table aligncenter\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Interested in buying proxies for faster scraping?<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong><a href=\"https:\/\/kocerroxy.com\/\">Check out our proxies!<\/a><\/strong><\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Buy proxies for faster scraping<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_is_Scraping_Slow\"><\/span><strong>Why is Scraping Slow?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #ffffff;color:#ffffff\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #ffffff;color:#ffffff\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Why_is_Scraping_Slow\" >Why is Scraping Slow?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#How_Multiprocessing_Speeds_Things_Up\" >How Multiprocessing Speeds Things Up<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Running_Multiple_Page_Scrapes_in_Parallel\" >Running Multiple Page Scrapes in Parallel<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Step_1_Single-threaded_Slow_Scraping\" >Step 1: Single-threaded (Slow) Scraping<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Step_2_Multiprocessing_for_Faster_Scraping\" >Step 2: Multiprocessing for Faster Scraping<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Scaling_Up_Large-Scale_Web_Scraping_with_10_Workers\" >Scaling Up: Large-Scale Web Scraping with 10+ Workers<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Multithreading_vs_Multiprocessing\" >Multithreading vs. Multiprocessing<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Python\" >Python<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#JavaScript\" >JavaScript<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Multiprocessing_or_Threads_for_Paginated_Scraping\" >Multiprocessing or Threads for Paginated Scraping<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Monitoring_Scraper_Performance_and_Debugging_Issues\" >Monitoring Scraper Performance and Debugging Issues<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Why_Do_You_Need_a_Scraper_Dashboard\" >Why Do You Need a Scraper Dashboard?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Step_1_Install_Flask\" >Step 1: Install Flask<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Step_2_Build_a_Simple_Scraper_with_Monitoring\" >Step 2: Build a Simple Scraper with Monitoring<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Step_3_Run_the_Dashboard\" >Step 3: Run the Dashboard<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Step_4_Make_It_Look_Nice_Optional_Frontend\" >Step 4: Make It Look Nice (Optional Frontend)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Step_5_Serve_the_Dashboard_in_Flask\" >Step 5: Serve the Dashboard in Flask<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#What_This_Dashboard_Does\" >What This Dashboard Does:<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/kocerroxy.com\/blog\/multiprocessing-for-faster-scraping\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n\n\n\n\n<p class=\"wp-block-paragraph\">By default, web scraping is <strong>single-threaded<\/strong>. Meaning <strong>your script scrapes one page at a time.<\/strong> This is fine if you&#8217;re dealing with <strong>10 pages<\/strong>, but what about <strong>10,000<\/strong>?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What\u2019s slowing you down?<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Network Latency<\/strong>. Every request has to travel across the internet and back.<\/li>\n\n\n\n<li><strong>Processing Time<\/strong>. Parsing the HTML and extracting data takes time.<\/li>\n\n\n\n<li><strong>Rate Limits<\/strong>. If you&#8217;re waiting between requests to avoid bans, it drags things out even more.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Solution?<\/strong> <strong>Scrape multiple pages in parallel.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Multiprocessing_Speeds_Things_Up\"><\/span>How Multiprocessing Speeds Things Up<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Multiprocessing allows your script to <strong>run multiple scrapers at once<\/strong>, using <strong>separate CPU cores.<\/strong> Imagine you have <strong>four workers<\/strong>, each scraping a different page simultaneously. It\u2019s like <strong>hiring a team instead of doing it alone<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How is Multiprocessing Different from Multithreading?<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Multiprocessing<\/strong> = Runs scrapers <strong>on multiple CPU cores<\/strong> (best for CPU-intensive tasks).<\/li>\n\n\n\n<li><strong>Multithreading<\/strong> = Runs scrapers <strong>on a single CPU core<\/strong> (best for I\/O-bound tasks like web requests).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">For web scraping, we <strong>don\u2019t need heavy computation<\/strong>, so <strong>multithreading works too<\/strong>, but <strong>multiprocessing is often faster<\/strong> when dealing with many pages.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your secret weapon here is something called a <strong>data queue<\/strong>. Picture it as a to-do list for your scraper: each URL patiently waiting its turn, processed one-by-one in a FIFO (first-in, first-out) manner. With this structure, no URL slips through the cracks or gets scraped twice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your queue feeds tasks to specialized &#8220;worker&#8221; threads or processes. These workers handle making HTTP requests, grabbing page data, and parsing responses\u2014keeping everything tidy and efficient.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But when multiple workers are involved, synchronization becomes critical. Without it, you risk nasty problems like race conditions, where multiple threads collide over the same resource. To handle this smoothly, programmers often rely on things like <strong>event loops<\/strong> or <strong>callback functions<\/strong>. Think of these as traffic controllers guiding data flow, making sure each thread knows exactly what to do and when\u2014without stepping on anyone\u2019s feet.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Running_Multiple_Page_Scrapes_in_Parallel\"><\/span>Running Multiple Page Scrapes in Parallel<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Let\u2019s say you need to <strong>scrape 100 pages<\/strong> of an e-commerce site. Instead of scraping them <strong>one by one<\/strong>, we\u2019ll split the work across <strong>four processes<\/strong>, making things <strong>four times faster.<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_1_Single-threaded_Slow_Scraping\"><\/span>Step 1: Single-threaded (Slow) Scraping<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Here\u2019s what a <strong>basic scraper<\/strong> looks like when scraping one page at a time:<\/p>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-2c90304e wp-block-group-is-layout-flex\">\n<pre class=\"wp-block-code\"><code>import requests<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>from bs4 import BeautifulSoup<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>def scrape_page(page):<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;url = f\"https:\/\/example.com\/products?page={page}\"<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;response = requests.get(url, headers={\"User-Agent\": \"Mozilla\/5.0\"})<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;soup = BeautifulSoup(response.text, \"html.parser\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;products = &#91;p.text.strip() for p in soup.find_all(\"div\", class_=\"product-item\")]<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;print(f\"Scraped Page {page}: {len(products)} products\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code># Scrape 1 to 10 sequentially (SLOW)<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>for page in range(1, 11):<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;scrape_page(page)<\/code><\/pre>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u23f3 <strong>Takes forever if you have thousands of pages!<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_2_Multiprocessing_for_Faster_Scraping\"><\/span>Step 2: Multiprocessing for Faster Scraping<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Now, let\u2019s use <strong>multiprocessing<\/strong> to <strong>scrape multiple pages at the same time to make it run 4x faster than the single-threaded version.<\/strong><\/p>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-2c90304e wp-block-group-is-layout-flex\">\n<pre class=\"wp-block-code\"><code>import requests<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>from bs4 import BeautifulSoup<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>from multiprocessing import Pool<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>def scrape_page(page):<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;url = f\"https:\/\/example.com\/products?page={page}\"<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;response = requests.get(url, headers={\"User-Agent\": \"Mozilla\/5.0\"})<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;soup = BeautifulSoup(response.text, \"html.parser\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;products = &#91;p.text.strip() for p in soup.find_all(\"div\", class_=\"product-item\")]<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;print(f\"Scraped Page {page}: {len(products)} products\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>if __name__ == \"__main__\":<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;pages = range(1, 101)&nbsp; # Scrape 100 pages<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;with Pool(4) as p:&nbsp; # Use 4 parallel workers<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;p.map(scrape_page, pages)<\/code><\/pre>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How This Works:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>We <strong>define<\/strong> scrape_page(page) as a function that scrapes a single page.<\/li>\n\n\n\n<li>We create a list of pages (pages = range(1, 101)).<\/li>\n\n\n\n<li>We use <strong>multiprocessing.Pool(4)<\/strong> to create <strong>4 workers<\/strong> that scrape pages in parallel.<\/li>\n\n\n\n<li><strong>Each worker gets its own page to scrape<\/strong> instead of waiting in line.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Scaling_Up_Large-Scale_Web_Scraping_with_10_Workers\"><\/span>Scaling Up: Large-Scale Web Scraping with 10+ Workers<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Want to scrape <strong>1000 pages even faster<\/strong>? <strong>Increase the number of workers!<\/strong><\/p>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-2c90304e wp-block-group-is-layout-flex\">\n<pre class=\"wp-block-code\"><code>if __name__ == \"__main__\":<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;pages = range(1, 1001)&nbsp; # Scrape 1000 pages<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;with Pool(10) as p:&nbsp; # Use 10 parallel workers<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;p.map(scrape_page, pages)<\/code><\/pre>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Be careful! <strong>Too many workers can get you banned<\/strong> because you\u2019re sending <strong>too many requests too quickly.<\/strong> Use <strong>rotating proxies<\/strong> if needed.<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">Also read: <a href=\"https:\/\/kocerroxy.com\/blog\/rotating-residential-proxies\/\"><strong>Top 5 Best Rotating Residential Proxies<\/strong><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Multithreading_vs_Multiprocessing\"><\/span><strong>Multithreading vs. Multiprocessing<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Both Python and JavaScript offer support for multithreading and multiprocessing, each with specific use cases and limitations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Python\"><\/span>Python<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In Python, multithreading involves executing multiple threads simultaneously within a single process, allowing for tasks like I\/O-bound operations (e.g., web requests) to run concurrently. However, due to Python\u2019s Global Interpreter Lock (GIL), true parallel execution of CPU-bound tasks is limited.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, multithreading is highly effective when fetching data from multiple web sources concurrently:<\/p>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-2c90304e wp-block-group-is-layout-flex\">\n<pre class=\"wp-block-code\"><code>import threading<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>import queue<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>import requests<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>from bs4 import BeautifulSoup<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>def worker(q):<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;while True:<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;url = q.get()<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if url is None:<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;try:<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;response = requests.get(url)<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;soup = BeautifulSoup(response.content, 'lxml')<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;# Process data from soup<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;print(f\"Processed: {url}\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;except Exception as e:<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;print(f\"Error processing {url}: {e}\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;q.task_done()<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>q = queue.Queue()<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>num_threads = 10&nbsp; # Adjust the number of workers as needed<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>for i in range(num_threads):<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;threading.Thread(target=worker, args=(q,)).start()<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>urls = &#91;\"http:\/\/example.com\/page1\", \"http:\/\/example.com\/page2\", ...]&nbsp; # List of URLs<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>for url in urls:<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;q.put(url)<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>q.join()&nbsp; # Wait for all tasks to complete<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>for i in range(num_threads):<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;q.put(None)&nbsp; # Signal workers to stop<\/code><\/pre>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">When dealing with CPU-bound tasks, multiprocessing is preferable since it bypasses the GIL by utilizing multiple processes, allowing genuine parallel execution and better CPU utilization.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"JavaScript\"><\/span>JavaScript<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript, by design, is single-threaded, executing tasks sequentially. However, to achieve concurrency, JavaScript uses Web Workers. Web Workers run scripts in the background without blocking the main execution thread, thus enabling parallelism. However, Web Workers have limited access and cannot interact directly with the Document Object Model (DOM), which restricts their usage primarily to computation-heavy tasks or background operations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The choice between multithreading and multiprocessing in Python or the use of Web Workers in JavaScript depends heavily on the nature of the tasks and the constraints imposed by language architecture.<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">Also read: <a href=\"https:\/\/kocerroxy.com\/blog\/inspect-element-hacks-techniques-for-analyzing-websites\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Inspect Element Hacks: Techniques for Analyzing Websites<\/strong><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Multiprocessing_or_Threads_for_Paginated_Scraping\"><\/span><strong>Multiprocessing or Threads for Paginated Scraping<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ever stared at a site with endless pagination and thought, \u201cI could do this way faster if I scraped all these pages simultaneously?\u201d Yep, been there too.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here\u2019s how you can actually pull it off:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You start with one main process acting as the boss. Figure out the next URL you need to scrape, then delegate the dirty work to specialized subprocesses or threads. Think of your main process as a manager handing out tasks\u2014\u201cHey, scrape this page, please\u201d\u2014while each worker does the heavy lifting independently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Each subprocess or thread (aka your worker) receives a URL as its task, along with specific instructions. To avoid nasty surprises like getting blocked, you could even set each worker up with their own unique IP address or browser instance\u2014like giving each worker their own disguise so the website doesn\u2019t get suspicious.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While your workers scrape pages concurrently (at the same time), they push the data into a centralized queue, keeping everything organized. Back in the main process, the data collected can be processed sequentially, in the exact order it arrived, ensuring no chaos or duplication.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When building something like this, stick to some core principles of good coding:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Singleton<\/strong>: Keep centralized control (one queue, one URL manager, one boss process).<br><\/li>\n\n\n\n<li><strong>DRY (Don&#8217;t Repeat Yourself)<\/strong>: Write your scraping logic once, then reuse it. No copy-pasting!<br><\/li>\n\n\n\n<li><strong>Scalability<\/strong>: Design it so you can easily add more workers when you need to speed things up or reduce them when things get chill again.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Once you\u2019ve got multiprocessing or threads set up like this, scraping paginated websites turns from an endless chore into something manageable and, honestly, pretty satisfying.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Monitoring_Scraper_Performance_and_Debugging_Issues\"><\/span><strong>Monitoring Scraper Performance and Debugging Issues<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ever started a scraper, walked away, and <strong>came back to a disaster<\/strong>? Maybe half the requests <strong>failed<\/strong>. Maybe the script <strong>crashed on page 237<\/strong>. Or worse\u2014maybe <strong>you got blocked and didn\u2019t even notice<\/strong> until it was too late.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why <strong>monitoring matters.<\/strong> You want to <strong>see what\u2019s happening in real time.<\/strong> That way, if something goes wrong, you <strong>catch it immediately.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So, let\u2019s <strong>build a simple monitoring dashboard<\/strong> using Flask. It will:<br>\u2705 Show how many pages have been scraped.<br>\u2705 Log errors in real time.<br>\u2705 Help you <strong>debug faster<\/strong> instead of staring at terminal logs.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Do_You_Need_a_Scraper_Dashboard\"><\/span>Why Do You Need a Scraper Dashboard?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Without monitoring, you\u2019re scraping <strong>blindly.<\/strong> Here\u2019s what can go wrong:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u274c <strong>IP gets blocked mid-run.<\/strong> You don\u2019t notice until the next morning.<br>\u274c <strong>Scraper crashes on a weirdly formatted page.<\/strong> You lose hours of progress.<br>\u274c <strong>Some requests fail silently.<\/strong> You miss half your data without realizing it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A dashboard <strong>solves all of this<\/strong> by letting you see your scraper\u2019s health at a glance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_1_Install_Flask\"><\/span>Step 1: Install Flask<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">First, install Flask if you haven\u2019t already:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>pip install flask<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_2_Build_a_Simple_Scraper_with_Monitoring\"><\/span>Step 2: Build a Simple Scraper with Monitoring<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Here\u2019s how we <strong>track progress and display it in a Flask dashboard.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Scraper Code (Backend Logic)<\/strong><\/p>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-2c90304e wp-block-group-is-layout-flex\">\n<pre class=\"wp-block-code\"><code>import requests<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>from bs4 import BeautifulSoup<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>from flask import Flask, jsonify<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>import threading<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>import time<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>app = Flask(__name__)<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code># Shared data for tracking progress<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>scraper_status = {<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;\"pages_scraped\": 0,<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;\"errors\": 0,<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;\"last_page_scraped\": None<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>def scrape_page(page):<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;try:<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;url = f\"https:\/\/example.com\/products?page={page}\"<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;response = requests.get(url, headers={\"User-Agent\": \"Mozilla\/5.0\"})<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if response.status_code == 200:<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;soup = BeautifulSoup(response.text, \"html.parser\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;products = soup.find_all(\"div\", class_=\"product-item\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;scraper_status&#91;\"pages_scraped\"] += 1<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;scraper_status&#91;\"last_page_scraped\"] = page<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;print(f\"\u2705 Scraped Page {page}: {len(products)} products\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else:<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;scraper_status&#91;\"errors\"] += 1<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;print(f\"\u274c Failed to scrape Page {page}, Status Code: {response.status_code}\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;except Exception as e:<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;scraper_status&#91;\"errors\"] += 1<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;print(f\"\u274c Error scraping Page {page}: {str(e)}\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>@app.route(\"\/status\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>def get_status():<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;return jsonify(scraper_status)<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>def start_scraping():<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;for page in range(1, 101):&nbsp; # Scrape first 100 pages<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;scrape_page(page)<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;time.sleep(1)&nbsp; # Prevent hitting rate limits<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>if __name__ == \"__main__\":<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;threading.Thread(target=start_scraping, daemon=True).start()<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;app.run(debug=True, port=5000)<\/code><\/pre>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_3_Run_the_Dashboard\"><\/span>Step 3: Run the Dashboard<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Save this file as scraper_monitor.py and run:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>python scraper_monitor.py<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Now, open <strong>http:\/\/127.0.0.1:5000\/status<\/strong> in your browser, and you\u2019ll see something like:<\/p>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-2c90304e wp-block-group-is-layout-flex\">\n<pre class=\"wp-block-code\"><code>{<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;\"pages_scraped\": 37,<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;\"errors\": 2,<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;\"last_page_scraped\": 37<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>}<\/code><\/pre>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>You now have a real-time status page for your scraper!<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_4_Make_It_Look_Nice_Optional_Frontend\"><\/span>Step 4: Make It Look Nice (Optional Frontend)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Want something fancier? Let\u2019s add a <strong>frontend using JavaScript<\/strong> so you can see the progress dynamically.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Create an HTML File (<\/strong><strong>dashboard.html<\/strong><strong>)<\/strong><\/p>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-2c90304e wp-block-group-is-layout-flex\">\n<pre class=\"wp-block-code\"><code>&lt;!DOCTYPE html&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;html lang=\"en\"&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;head&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&lt;meta charset=\"UTF-8\"&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&lt;meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\"&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&lt;title&gt;Scraper Dashboard&lt;\/title&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&lt;style&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;body { font-family: Arial, sans-serif; text-align: center; }<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#status { font-size: 24px; margin-top: 20px; }<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&lt;\/style&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;\/head&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;body&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&lt;h1&gt;Scraper Monitoring Dashboard&lt;\/h1&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&lt;div id=\"status\"&gt;Loading...&lt;\/div&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&lt;script&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;function updateStatus() {<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;fetch(\"\/status\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.then(response =&gt; response.json())<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.then(data =&gt; {<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;document.getElementById(\"status\").innerHTML = `<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;p&gt;\u2705 Pages Scraped: ${data.pages_scraped}&lt;\/p&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;p&gt;\u274c Errors: ${data.errors}&lt;\/p&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;p&gt;\ud83d\udd04 Last Page Scraped: ${data.last_page_scraped}&lt;\/p&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;`;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;})<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.catch(error =&gt; console.error(\"Error fetching status:\", error));<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;setInterval(updateStatus, 3000);&nbsp; \/\/ Update every 3 seconds<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;\/body&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;\/html&gt;<\/code><\/pre>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_5_Serve_the_Dashboard_in_Flask\"><\/span>Step 5: Serve the Dashboard in Flask<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modify your Flask app to serve the HTML file:<\/p>\n\n\n\n<div class=\"wp-block-group is-vertical is-layout-flex wp-container-core-group-is-layout-2c90304e wp-block-group-is-layout-flex\">\n<pre class=\"wp-block-code\"><code>from flask import send_file<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>@app.route(\"\/\")<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>def dashboard():<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>&nbsp;&nbsp;&nbsp;&nbsp;return send_file(\"dashboard.html\")<\/code><\/pre>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Now, go to <strong>http:\/\/127.0.0.1:5000\/<\/strong> and see your scraper <strong>update in real time!<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_This_Dashboard_Does\"><\/span>What This Dashboard Does:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u2705 Tracks <strong>how many pages<\/strong> have been scraped.<br>\u2705 Displays <strong>error counts<\/strong> so you know if something went wrong.<br>\u2705 Shows the <strong>last page scraped<\/strong> (so if it crashes, you know where to restart).<br>\u2705 Updates <strong>every 3 seconds<\/strong> so you don\u2019t have to refresh manually.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why This is a Game-Changer?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Without a dashboard:<br>\u274c You don\u2019t know if your scraper is still running.<br>\u274c You have to check logs manually.<br>\u274c You waste time figuring out where it broke.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With a dashboard:<br>\u2705 You <strong>see everything in real time<\/strong>.<br>\u2705 If errors pop up, <strong>you fix them instantly<\/strong>.<br>\u2705 You don\u2019t waste hours scraping <strong>only to realize nothing worked.<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">Also read: <a href=\"https:\/\/kocerroxy.com\/blog\/free-libraries-to-build-your-own-web-scraper\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Free Libraries to Build Your Own Web Scraper<\/strong><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Scraping shouldn\u2019t feel like watching paint dry or worse, debugging at 2 a.m. because half your data disappeared. With the right tools and a little structure, you can go from painfully slow loops to fast, reliable, and scalable scrapers that actually <em>work<\/em>. By embracing modern libraries and frameworks, you can significantly enhance efficiency while reducing the complexity of your code. <a href=\"https:\/\/kocerroxy.com\/blog\/how-to-automate-data-scraping-for-real-time-results\">Automating data scraping<\/a>saves time and minimizes errors that often plague manual processes. With a well-structured approach, you can focus on deeper insights rather than getting bogged down by technical hurdles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Multiprocessing and multithreading turn your lonely, single-threaded script into a well-oiled data-collecting machine. Whether you\u2019re pulling 10 pages or 10,000, running tasks in parallel can cut hours off your scrape time\u2014and your stress.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A shared queue is your clipboard, keeping everything in order so no page gets skipped or scraped twice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And a monitoring dashboard is your eyes and ears. It tells you what\u2019s happening <em>right now<\/em>, so you\u2019re not flying blind. You spot problems early, restart where you left off, and impress clients (or your future self) with clean, structured data delivered on time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So next time you need to scrape at scale, don\u2019t brute-force it. Split the work. Track everything. Stay in control.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Now go build something awesome and scrape like a pro.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tired of slow web scrapers? Discover how to use multiprocessing for faster scraping and boost your scraping speed instantly!<\/p>\n","protected":false},"author":3,"featured_media":7693,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[139],"tags":[184,24],"class_list":["post-7692","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-web-scraping","tag-programming","tag-web-scraping"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Multiprocessing for Faster Scraping - KocerRoxy<\/title>\n<meta name=\"description\" content=\"Tired of slow web scrapers? 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