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.

Rendering large lists in React can genuinely kill performance. Here is a troubleshooting guide based on which library to use for which specific problem.

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

useTransition is often reached for as a generic performance fix, but it solves a narrow, specific problem. Here is what it actually does and when it measurably helps, based on actual profiling.

React.memo is genuinely useful but frequently misapplied. Here is the actual decision framework I use after profiling dozens of components.

These two hooks are often confused, but they solve genuinely different problems. Here is the practical distinction based on actual profiling.

Guessing at performance problems wastes time. Here is the actual workflow I use with the Profiler to find what is genuinely slow before optimizing anything.

Code splitting genuinely reduces initial load time, but only when applied at the right boundaries. Here is what actually worked when I measured it.

Slow list rendering has a small number of genuinely common causes. Here is the diagnostic process I actually use, with the specific fix for each cause.

Context is genuinely convenient but causes specific, measurable performance issues when misused. Here is what I found when profiling context-heavy applications.