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Performance

Performance

Making pages load faster: Core Web Vitals, compression, caching, images and render-blocking resources.

5
Guides
21 min
Reading

Start here

First read5 min read

Core Web Vitals: what LCP, INP and CLS measure

What LCP, INP and CLS measure, the "good" limits at the 75th percentile, field versus lab data, and the usual causes and fixes for each metric.

Read guide

Beginner

1 guides

Web performance metrics: TTFB, FCP, Speed Index and TBT

What TTFB, First Contentful Paint, Speed Index, Total Blocking Time, page weight and request count tell you, and why to track the 75th percentile.

4 min read

Intermediate

2 guides

HTTP caching headers: Cache-Control, ETag and 304s

How Cache-Control directives, ETag and Last-Modified validators and 304 responses work, plus sensible headers for HTML pages and hashed static assets.

4 min read

Optimizing web assets: images, fonts, JavaScript and CSS

How to shrink and load images, fonts, JavaScript, CSS and third-party scripts: modern formats, lazy loading, font-display, code splitting and Brotli.

4 min read

Advanced

1 guides

Browser rendering: style, layout, paint and composite

What the browser does for each frame, which CSS and DOM changes trigger layout or paint, why layout thrashing is slow, and how long tasks drop frames.

4 min read

Tools for this topic

Try what these guides describe on your own URLs, domains, code or files.

Image Compressor

Compress JPEG, PNG, WebP and AVIF images in your browser, resize them or set a target file size. Nothing is uploaded.

Open tool
Website Launch Readiness Checker

Sign in to check a homepage before launch for uncompressed HTML, large sampled images and images missing width and height.

Open tool

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