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.

This choice is often framed as a performance decision, but the measured difference is smaller than commonly assumed. Here is what testing showed in practice.

Key prop mistakes cause subtle performance and correctness issues that are easy to miss. Here is what to watch for when debugging these specific issues.

These two techniques are often confused, and getting the implementation wrong defeats the actual performance benefit. Here is what distinguishes the two approaches.

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

Forms with many fields or complex validation can become quite sluggish. Here is what truly causes this and the specific fixes that help.

Not every application needs aggressive optimization, and applying it prematurely adds genuine cost. Here is the honest framework I use before recommending any optimization work.

Server Components are often discussed abstractly. Here is what changes for performance in practice, based on working through real migration scenarios.