React Scan automatically detects performance issues in your React app 
Previously, existing tools required lots of code change, lacked simple visual cues, and didn't have a simple, portable API
Instead, React Scan:
- Requires no code changes
 - Highlights exactly the components you need to optimize
 - Available via script tag, npm, you name it!
 
index.html
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                        <!-- paste this BEFORE any scripts -->
<script
  crossOrigin="anonymous"
  src="//unpkg.com/react-scan/dist/auto.global.js"
></script>
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