Performance — React.memo, useMemo, useCallback
Learn when React performance optimization matters, how to profile, and how to avoid the most common mistakes.
Here's a controversial take: most React performance optimization is unnecessary. React is fast by default. The render cycle that developers obsess over — the virtual DOM diffing, the reconciliation — takes microseconds for typical components.
But there are cases where it matters. Rendering a list of 500 items. Components that trigger expensive computations. Real-time updates at 60fps. Knowing when and how to optimize is the skill — not knowing the API surface of useMemo.
This lesson teaches you to identify real performance problems before reaching for optimization tools.
The Golden Rule
Don't optimize until you've measured. Adding React.memo to every component doesn't make your app faster — it makes it more complex while adding the overhead of shallow comparison on every re
This lesson is part of the Guild Member curriculum. Plans start at $29/mo.