Planet Performance

Obs.js is a tiny inline script that helps you adapt your site to real-world network, battery, CPU, and memory conditions.

Lighthouse 13.3 came out this week, and includes a new category called "Agentic Browsing". Let's take a look at the new audits included in this category.

What is the agentic browsing category?

No-Vary-Search lets HTTP caches ignore irrelevant query parameters such as UTM tags, while still keeping meaningful ones like product variants in the cache key.

The Architecture Of Local-First Web Development Durgesh Pawar 2026-05-06T10:00:00+00:00 2026-05-06T16:39:14+00:00

Last October, I was sitting in a hotel room in Lisbon, the night before I was supposed to demo a project management tool my team had spent four months building. The hotel Wi-Fi was doing that thing where it connects but nothing actuall...

How we used Playwright to generate 585+ screenshots across every theme and viewport, and accidentally built a design QA tool for visual consistency.