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Page Speed Optimization Checklist

Interactive checklist of 26 page speed optimization techniques with impact ratings. Track your progress across images, CSS, JavaScript, server, fonts, and Core Web Vitals.

Use modern image formats (WebP/AVIF)

Lazy load offscreen images

Serve properly sized images

Compress images

Set image dimensions

Inline critical CSS

Minify CSS

Remove unused CSS

Defer non-critical CSS

Defer non-critical JavaScript

Minify JavaScript

Code-split and lazy load routes

Tree-shake unused exports

Audit third-party scripts

Enable GZIP/Brotli compression

Set cache headers

Use a CDN

Use HTTP/2 or HTTP/3

Preconnect to origins

Use font-display: swap

Subset custom fonts

Preload key fonts

Consider system font stack

Optimize LCP (<2.5s)

Prevent CLS (<0.1)

Optimize INP (<200ms)

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