The Problem

Your React app feels bloated and sluggish.

🔄

Wasted renders compound silently

A single component re-rendering unnecessarily on every parent state change cascades into hundreds of wasted renders per second — and the app just feels slow.

📦

Bundles balloon over time

No one imports a whole library on purpose. But inline imports, missing tree-shaking, and unguarded dynamic deps bloat your JS bundle without anyone noticing.

🔧

useMemo and useCallback are misused constantly

Developers add memoization thinking it helps — but wrong dependency arrays or unstable references make it do nothing, or worse, cause stale closure bugs.

🌊

Context triggers full subtree re-renders

Every context value change re-renders every consumer. In large apps this is catastrophic — and the team often doesn't realise it's happening until it's out of control.

Wasted Re-renders Broken useMemo Unstable useCallback Missing React.memo Context Re-render Storms Bundle Size Bloat Missing Code Splitting Inline Object Props useEffect Dependency Hell Key Prop Misuse Expensive Inline Functions Unvirtualized Long Lists Wasted Re-renders Broken useMemo Unstable useCallback Missing React.memo Context Re-render Storms Bundle Size Bloat Missing Code Splitting Inline Object Props useEffect Dependency Hell Key Prop Misuse Expensive Inline Functions Unvirtualized Long Lists
50 React Performance Issues · 50 Claude Code Prompts

React
at full
speed.

50 React performance anti-patterns — wasted renders, bloated bundles, broken memoization, and more — find them all with a Master Prompt for Claude Code that reports every instance in your codebase. Use the individual-issue prompts to have Claude implement fixes for any issues that apply to you.

⚡ Get Instant Access — $49 Browse all 50 issues ↓
50
Issues
50
Prompts
<15m
Full Audit
$49
One-Time
React DevTools — Profiler
Flamegraph
Ranked
Timeline
Component Render time
App
App
84.2ms
ProductList
ProductList
66.1ms
ProductCard ×48
ProductCard
50.8ms
Header
Header
16.9ms
useGlobalStore
hook
11.8ms
Footer
Footer
3.4ms
Wasted renders this commit 48 total
ProductCard
×48
50.8ms
Critical
useGlobalStore
×12
11.8ms
High
Header
×6
4.2ms
Fix →
FPS
14
target: 60
After Fix
60

We've all been there.

React performance problems are sneaky. The app feels fine in development. Then you ship to real users on real devices with real data — and suddenly everything feels sluggish. You open React DevTools and see hundreds of wasted renders per second, a bundle three times larger than you expected, and a context provider re-rendering half the component tree on every keystroke.

I got tired of chasing these issues one by one across large codebases, so I built a systematic way to find and fix all of them. No profiler parsing, no guesswork. Just one Master Prompt to find the issues and 50 targeted prompts that tell Claude Code exactly what to fix.

The CodeVigilante for React Prompt Pack is my must-have tool:

  • 50 React Performance Issues: Wasted renders, broken memoization, context re-render storms, bundle bloat, unvirtualized lists — compiled by a senior engineer using React in real production apps.
  • 50 Claude Code Prompts: One per issue. Each one scans your entire component tree, finds every instance of the problem, and applies the fix with an explanation.
  • React 18 & 19 Ready: Covers modern patterns — Suspense, concurrent features, and server components — not just the hooks basics everyone already knows.

You could spend a week with React DevTools and a bundle analyser manually tracking down every wasted render. Or you can grab this for just $49 and let Claude do the audit while you ship features.

If you run this against your project and it doesn't find and fix at least one real performance issue you didn't already know about, just let me know. Full refund, no questions asked.

Get Full Access — $49
The Checklist

50 Issues.
One Prompt.
Every Render Earned.

Each entry explains the performance anti-pattern, its real-world impact on UX and Lighthouse scores, and a Claude Code prompt that scans your codebase and applies the fix.

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// Items 16 – 50 Locked
Unlock All 50 Issues + Prompts
Get the complete checklist with every Claude Code prompt, organized by category.
⚡ Get Full Access — $49

One payment.
Lifetime access.

🚀 Launch Pricing
CodeVigilante for React
$97 $49
One-time · No subscription · Instant delivery
  • Complete checklist of 50 React performance anti-patterns
  • 50 copy-paste Claude Code prompts — one per issue
  • Severity ratings (Critical / High / Medium) for prioritization
  • Covers React 17, 18 & 19 — hooks, concurrent features, and Suspense
  • Works with Next.js, Vite, CRA, and any React framework
  • Interactive HTML checklist — no login, works offline
  • Free updates as React evolves
⚡ Get Instant Access — $49
🛡 30-day money-back guarantee · No questions asked

Common questions.

Yes. The checklist covers React 17, 18, and 19 patterns — including concurrent features, Suspense, the new compiler in React 19, and the transition from class components to hooks. Version-specific behaviours are called out in each prompt.
Yes. The issues covered are React-layer concerns — component rendering, hook usage, memoization, bundle splitting, and state management patterns. They apply regardless of which framework hosts your React app.
Yes. Several prompts are library-aware — covering over-subscription patterns in Zustand, selector misuse in Redux Toolkit, unnecessary context vs external state, and Jotai/Recoil atom granularity issues.
No, but you do need an AI coding agent of some kind. The prompts are designed with Claude Code in mind, but you should have no problem using them with Codex, Junie, or whatever agent you prefer.
A self-contained interactive HTML file you open in any browser — no internet required, no login. Check off issues as you fix them, copy prompts with one click, filter by category, and track progress.
30-day full refund, no questions asked. Email us and you'll receive your refund within 24 hours.

A flicker-free UI isn't a luxury
it's a requirement.

One-time · $49 · Instant access

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