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When to useMemo: A React Performance Guide

· 17 min read
Evan Carter
Evan Carter
Senior frontend

TLDR:

React useMemo Optimization

useMemo can speed up React apps by caching expensive derived data and stabilizing props for memoized children—but it can also add overhead when used blindly. This guide explains practical heuristics, profiling-driven decisions, and how Feature-Sliced Design reduces render churn by enforcing boundaries and public APIs.