Performance & Scalability

A bloated JavaScript bundle is a silent performance tax on every user. Learn how to audit your bundle with webpack-bundle-analyzer and Next.js bundle tools, identify the worst offenders, and apply tree shaking, code splitting, and lazy loading to cut your bundle by 40% or more.

CDN misconfiguration is one of the hardest bugs to catch in QA — it works perfectly in staging (which bypasses the CDN) but fails in production. Learn how to test cache headers, validate invalidation logic, and build automated checks that keep your caching layer honest.

Deadlocks and lock contention are among the hardest bugs to reproduce in testing environments — they require concurrent access, specific data states, and timing precision. This guide explains how to detect, reproduce, and prevent database locking issues before they hit production.

Black Friday doesn't forgive unpreparedness. Learn how to simulate realistic traffic spikes with k6, interpret results to find your system's breaking point, and build a repeatable load testing pipeline that runs automatically before every major release.

Largest Contentful Paint directly impacts conversion rates — every 100ms of LCP improvement can increase conversions by up to 1%. This playbook walks through diagnosing LCP bottlenecks on e-commerce product pages and implementing fixes that move the metric from red to green.