Performance

Custom hooks look like plain functions, but they carry hidden performance costs. Here's how beginner-level hook code differs from the patterns experienced React developers reach for.

Long tasks, blocked main threads, and sluggish interactions usually trace back to JavaScript execution time. Here are the practical questions to ask when you're diagnosing this in a React app.

By the end of this guide, you'll be able to diagnose whether your rendering strategy is causing a specific performance problem and apply the correct fix instead of guessing.

Lighthouse scores and real-user Core Web Vitals often disagree, sometimes by a wide margin. Here's what the data shows about measuring performance correctly in React.

React Compiler promises to eliminate manual useMemo and useCallback calls. Here is a practical, step-by-step look at how it works and how to adopt it safely.

I'm often asked whether to use CSS or a library like Framer Motion for React animations. Here's the 3-step decision process I use to guarantee a smooth 60fps.

I've seen React apps grind to a halt during heavy computations. The problem isn't React, it's the single-threaded nature of JavaScript. Here's how we use Web Workers to fix it.

I profiled a React app that felt sluggish despite simple component logic. The problem wasn't the code we wrote, but the massive third-party libraries we imported. Here's how to diagnose and fix it.

I was asked to diagnose a React app failing its Core Web Vitals. The culprit was image handling. Here is the step-by-step process we followed to fix it.

Dependency array issues are responsible for a large share of the React bugs I get asked to debug. Here is what causes them under the hood and how to fix each variant.