We make code verification tools for humans and agents reactbench.com react.doctor
San Francisco, CA
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Did you know:
you can run React Scan on any website instantly when using the CLI
npx react-scan@latest <url>
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we're starting a React Scan working group:
if you:
1. use react scan daily
2. want to try early releases & give feedback
send me a dm :)
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Introducing React Scan v0.2
A drop-in script that detects slow React performance
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Now this is incredible customer support. 18 minutes from bug report to deployed fix.
Excellent work @aidenybai @RobKnight__ @milliondotjs
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This week in React Scan:
React Scan notifies when page is slow, and tells you what to optimize
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React Scan 0.1.2 is out!
- new component tree view
- smaller, cleaner toolbar
- major performance improvements
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Why is React so slow? React Scan inspired me to do a deep dive. New video up now!
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we heard you – we're changing react-scan to be less annoying and more useful.
we're calling this effort "Precise Activation"
if you're an active user of react-scan, we'd love your feedback (link in next tweet)
ALT https://github.com/aidenybai/react-scan/issues/207
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Introducing Replay for React Scan:
1. Automatically save clips when performance drops
2. Get detailed breakdowns of what happened
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Aiden Bai: Optimizing React with React Scan nitter.catsarch.com/i/broadcasts/1rmGPoobm…
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how to read any performance profile (Chrome Devtools):
1. look for long tasks (highlighted in red)
2. look down to find spans w/ high self time relative to total time (highlighted in green)
3. click the span to investigate source code (profit!)
ALT more comprehensive guide: https://developer.chrome.com/docs/devtools/performance
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Introducing React Scan v0.1:
A drop-in <script> to scan your React app for slow performance and renders
5 min to setup. Try it out!
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in the next version of React Scan:
record & replay renders (and UI changes!)
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