what is hooks-perf-issues fr?

gaearon/hooks-perf-issues — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2019-03-03

★ 13JavaScriptAudience · developerComplexity · 2/5DormantSetup · easy

vibe map

mindmap
  root((repo))
    What it does
      Hooks vs classes demo
      Shows perf pitfall
      Educational only
    Tech stack
      JavaScript
      React
      React.memo
    Use cases
      Learn why app feels slow
      Understand callback identity
      Fix unnecessary re-renders
    Audience
      React developers
      Performance learners
    Cause
      New callback each render
      Memoized children re-render

mindmap root((repo)) What it does Hooks vs classes demo Shows perf pitfall Educational only Tech stack JavaScript React React.memo Use cases Learn why app feels slow Understand callback identity Fix unnecessary re-renders Audience React developers Performance learners Cause New callback each render Memoized children re-render

what do people make with this?

VIBE 1

Understand why a hooks-based React app feels slower than expected.

VIBE 2

Learn how new callback functions defeat React.memo optimizations.

VIBE 3

Compare measured render timings between hooks and class components.

VIBE 4

Get guidance on managing hook dependencies to avoid unnecessary re-renders.

what's the stack?

JavaScriptReact

how it stacks up fr

	gaearon/hooks-perf-issues	09catho/axon	abdulrdeveloper/react--tic-tac-toe
Stars	13	13	13
Language	JavaScript	JavaScript	JavaScript
Last pushed	2019-03-03	—	—
Maintenance	Dormant	—	—
Setup difficulty	easy	moderate	easy
Complexity	2/5	4/5	1/5
Audience	developer	researcher	developer

Figures from each repo's GitHub metadata at analysis time.

how do i run it?

Difficulty · easy time til it works · 5min

prompts (copy fr)

prompt 1

Explain why this repo's hook version is 4-5x slower than the class version.

prompt 2

Show me how React.memo fails to prevent re-renders when callbacks change identity.

prompt 3

Help me apply the lesson from gaearon/hooks-perf-issues to fix slow re-renders in my own React app.

prompt 4

What are the fixes for the callback-identity problem shown in this repo?

Frequently asked questions