#webperf

Visa portals, exam forms, and job applications all ask for the same thing: a photo under 100KB. Most...

Strong first-party RUM on Vercel projects. Not a multi-client PageSpeed portfolio. Here is when it is enough, and when it is not.

Learn how to build lightweight, zero-dependency CSS logo marquees that preserve Core Web Vitals and handle static site generation fallback securely.

Cá Viên Chiên is a small browser game about running a Vietnamese fried fish ball cart. During a UI...

How to script Google Lighthouse in bulk with chrome-launcher, which numbers to keep, and what I learned about score variance running it in the cloud.

Add CSS animations to Codex themes without wrecking performance.

Enable Brotli with a gzip fallback for HTML, CSS, and JavaScript so text assets shrink on the wire without double-compressing images or burning origin CPU that...

The image pipeline news sites use to keep load times fast.

Learn how to build an infinite smooth marquee using pure modern CSS that delivers 60fps hardware acceleration without hurting Core Web Vitals.

Cloudflare's BEACON dataset covers billions of real-user page loads. Here is what it suggests fixing first for Core Web Vitals: TTFB, load delay, Safa

Same URL, same Lighthouse engine: different CPU, throttling, and cache. Compare tools fairly instead of merging the scores.

Learn how to build an always-on-top floating web timer using the Document Picture-in-Picture API with zero clock drift and full DOM interactivity.