Most React performance problems are not fixed with useMemo.
A lot of developers see a component re-rendering and immediately reach for:
useMemo() useCallback() React.memo()
But in many cases, that just makes the code more complex without solving the real problem.
The better question is not:
“How do I stop this component from re-rendering?”
The better question is:
“Why is this component receiving changes it does not actually need?”
In my experience, most React performance issues come from:
State living too high in the component tree
Passing unstable objects/functions as props
Context providers wrapping too much of the app
Components doing too many unrelated jobs
Rendering large lists without virtualization
useMemo can help, but it should usually be the second or third solution — not the first one.
A simple rule I use:
Before optimizing a component, first fix the data flow.
Clean architecture beats random memoization almost every time.
What is your usual first step when a React component becomes slow?
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