PageSpeed Metrics
58 items from csabapalfi/awesome-pagespeed-metrics ★695
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web-vitals github.com
Small library to accurately measure Core Web Vitals (LCP, FID, CLS, INP, TTFB) in the browser.
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Which third party scripts are most excessive github.com
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Polyfill - FID github.com
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PageSpeed Insights developers.google.com
Page Speed Insights measures the performance of a page for mobile devices and desktop devices.
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Spec - Layout Instability API - W3C github.com
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Spec - LCP - W3C github.com
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Webpagetest webpagetest.org
Web Page Test gives you an overall performance waterfall as well as rendering timeline for sites. It also provides critical insight into time to first byte and what could be holding back web page performance.
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Sitespeed.io sitespeed.io
Open-source tool that checks your site against web performance best practices and uses the Navigation Timing API to collect metrics. Outputs XML and HTML reports.
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Perfume.js zizzamia.github.io
Tiny, web performance monitoring library that reports field data back to your favorite analytics tool.
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Can You Afford It?: Real-world Web Performance Budgets infrequently.org
Can You Afford It?: Real-world Web Performance Budgets.
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User Timing w3.org
This specification defines an interface to help web developers measure the performance of their applications by giving them access to high-precision timestamps.
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Navigation Timing Level 2 (W3C) w3.org
Use responseStart and requestStart to derive Time to First Byte (TTFB).
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Spec - Element Timing API wicg.github.io
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Docs - TTI - web.dev web.dev
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Docs - TBT - web.dev web.dev
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Docs - Speed Index - web.dev web.dev
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Docs - LCP - web.dev web.dev
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Docs - FID - web.dev web.dev
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Docs - FCP - web.dev web.dev
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Docs - CLS - web.dev web.dev
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Spec - Paint Timing - W3C w3c.github.io
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Spec - Long Tasks w3c.github.io
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Spec - Resource Timing w3.org
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Vercel Analytics vercel.com
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treo.sh treo.sh
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Qualys SSL Labs ssllabs.com
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