A curated list of Web Performance Optimization.
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Updated
Oct 16, 2026
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Automate running Lighthouse for every commit, viewing the changes, and preventing regressions
sitespeed.io is an open-source tool for comprehensive web performance analysis, enabling you to test, monitor, and optimize your website’s speed using real browsers in various environments.
web monitoring metrics performance-metrics performance-dashboard performance-analysis perfmatters webperf sitespeed
Make optimisation of images part of your automated build process
performance optimize compress pngcrush jpegoptim optipng webperf imageoptim gifsicle pngquant jpegtran image-optimisation jpegmini imagealpha pngout site-speed advpng
"SQIP" (pronounced \skwɪb\ like the non-magical folk of magical descent) is a SVG-based LQIP technique.
svg performance image placeholder images webperf user-experience webperformance lqip perceived-performance
Headless Chromium-based web performance metrics collector and monitoring tool
javascript css jquery automation dom metrics http2 chromium developer-tools webperf phantomas http3 domquery webperformance headless-chrome puppeteer
Tested JavaScript snippets that measure and debug web performance. Your AI agent runs them for you, or you run them yourself in DevTools: the same code every time.
cli snippets performance chrome-devtools performance-metrics performance-analysis webperf lcp webperformance ai-agents inp cls playwright core-web-vitals webvitals agent-skills claude-code
displays the import size of the package you are importing inside the code editor
A fast, flexible, and small SEO-friendly lazy loader.
performance image video poster lazy-load lazyload background lazy-loading lazyloading webperf lazyload-script autoplay
Progressive web metrics at your fingertipz
Performance-Bookmarklet helps to analyze the current page through the Resource Timing API, Navigation Timing API and User-Timing - requests by type, domain, load times, marks and more. Sort of a light live WebPageTest.
performance bookmarklet waterfall performance-metrics analyzer requests browser-extension webperf navigation-timing resource-timing user-timing
Context-aware web performance for everyone
CSS selectors complexity and performance analyzer
css sass metrics webperf phantomas webperformance css-source css-selectors-complexity dart-sass performance-analyzer
📉 Visualisation layer and data store for SpeedTracker
Responsive, SVG based HAR waterfall viewer
Curated resources that help you build lightning fast websites
前端性能指标的监控,采集以及上报。用于测量第一个dom生成的时间(FP/FCP/LCP)、用户最早可操作时间（fid|tti）和组件的生命周期性能,，网络状况以及资源大小等等。向监控后台报告实际用户测量值。
dns performance web-performance monitor dom navigation worker metrics performance-metrics fcp performance-analysis performance-monitoring perfmatters webperf navigation-timing user-timing tti fid fmp networkinformation
Discoveries on Sustainable Loading research
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