web performance

Chrome DevTools AI Assistance (Gemini): Enable + Prompt Guide 2026

Next.js 16 App Router Production Checklist (2026)

A practical Next.js 16 App Router production checklist for Server Components, PPR, caching, streaming, metadata, and SEO.

Nginx Gzip On vs Off: Localhost Wire Size and RPS Lab

Hands-on nginx gzip on/off lab: HTML ~107x smaller at level 1; JSON RPS ~1987 off vs ~1031 l1 vs ~563 l6 on localhost. Measured numbers, no Docker.

Nginx limit_req Rate-Limit Lab: Burst, nodelay, and the return Pitfall

Hands-on nginx 1.26 limit_req on localhost: 5r/s burst=10 nodelay yields 11/200 OK then 429s; return bypasses limiting; paced 5r/s stays green. Real numbers, no Docker.