React Context Killing Your Performance? Fix It Fast! |
Using React Context like a global store?
It might be slowing down your app — badly.
Here’s why:
When context value changes, all consumers re-render —
even components that didn’t need the updated data.
Example:
You store both theme and user in a single context.
Changing just the theme?
All components using that context — even those only reading user — will re-render.
What to do instead:
✅ Split your context: ThemeContext, UserContext
✅ Use useContextSelector to subscribe only to what you need
✅ Wrap context values in useMemo to avoid unnecessary updates
Context is powerful — but misused, it can quietly destroy performance.
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