Robin Chowdhury

Frontend performance architect at a large e-commerce site. Spends his days fighting third-party scripts.

Articles by Robin Chowdhury

Tools & Libraries Aug 25, 2026Advanced

Partytown in 2026: Sandbox Third-Party Scripts in a Web Worker and Save Your INP

Move GTM, GA4, and Meta Pixel into a web worker with Partytown. Real INP numbers, framework setup, dataLayer forwarding, and the caveats that break analytics.

Robin Chowdhury 13 min read

Tutorials Aug 09, 2026Intermediate

Timing-Allow-Origin Header: Unmask Zero-Duration Cross-Origin Resource Timing in 2026

Cross-origin resources report zero for duration, transferSize, and every phase timing unless the server emits Timing-Allow-Origin. Set it correctly on CDN, S3, or your API to unlock full Resource Timing and honest RUM data.

Robin Chowdhury 13 min read

Tutorials Jul 18, 2026Intermediate

Passive Event Listeners in 2026: Fix Scroll Jank From Third-Party Scripts

A passive event listener promises the browser you won't call preventDefault(), so the compositor thread can scroll immediately without waiting for JavaScript. Here's how I audit and fix the third-party offenders that still ship blocking touchstart and wheel handlers in 2026.

Robin Chowdhury 13 min read

Tutorials Jun 30, 2026Intermediate

Element Timing API: Measure Render Times Beyond LCP in 2026

Tag any image, price, or button with elementtiming and read its real paint timestamp from PerformanceObserver. Practical RUM setup, cross-origin gotchas, and the new Container Timing trial.

Robin Chowdhury 13 min read

Tutorials Jun 17, 2026Intermediate

Cross-Document View Transitions: Smooth MPA Navigation in 2026

Cross-document View Transitions let MPAs animate between pages like SPAs, opt in via one CSS rule. Real-world setup, named elements, Speculation Rules pairing, and Core Web Vitals impact from production.

Robin Chowdhury 14 min read