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.

useTransition is often reached for as a generic performance fix, but it solves a narrow, specific

React.memo is truly helpful but frequently misapplied. Here is the practical decision framework I use after profiling dozens of components.

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

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

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

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

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

Bundle size affects load time directly, but you need to measure what is truly in your bundle before you can meaningfully reduce it. Here is the process I use.

Understanding how React batches state updates explains a lot of confusing render behavior. Here is what is happening under the hood, based on testing across different scenarios.