Rails Performance from the Metal Up: A Field Guide
A practical Rails performance field guide for diagnosing CPU, IO, GVL, GC, memory, Puma, and container-runtime bottlenecks before choosing a fix.
Tag: puma
From 499 to 200: Fixing Nginx Timeouts in a Rails API
How Puma worker timeouts and Nginx 499 errors expose slow Rails requests, and how to fix them with aligned timeouts, background jobs, and caching.