Debugging

A memory leak in React is not the same thing as a slow render. Here is a troubleshooting checklist for the most common causes, with symptoms, root causes, and fixes.

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.

Seeing double renders in development with Strict Mode confuses many developers into thinking something is broken. Here is what is really happening and why.