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⚡ Bolt: Optimize LiquidStream message rendering#84

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bolt/optimize-liquidstream-render-8428159091205026627
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⚡ Bolt: Optimize LiquidStream message rendering#84
teerthsharma wants to merge 1 commit into
mainfrom
bolt/optimize-liquidstream-render-8428159091205026627

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@teerthsharma

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💡 What:

  • Extracted the message UI in LiquidStream.tsx into a MessageItem component wrapped with React.memo().
  • Updated the Message type to store a timestamp string.
  • Moved the new Date().toLocaleTimeString() call out of the render loop and into the handleSend state update, so it is only computed once per message.

🎯 Why:

  • LiquidStream stores messages in an array. Before this fix, appending a new message caused the entire array to re-render. Since new Date().toLocaleTimeString() was being called inline on every render for every message, not only was it wasting computation cycles (an O(N^2) bottleneck), but it was also technically overwriting the timestamp of older messages. Wrapping in React.memo and decoupling the timestamp guarantees old messages skip re-rendering.

📊 Impact:

  • Eliminates O(N^2) re-renders in the LiquidStream chat history. Reduces unnecessary re-renders by 100% for existing messages when a new message is streamed/added.

🔬 Measurement:

  • Verified the build via pnpm run build.
  • Verified UI functionality using Playwright script to simulate sending a message in a mounted test-route, confirming messages still display successfully and retain their timestamps correctly.

PR created automatically by Jules for task 8428159091205026627 started by @teerthsharma

…mestamp

Extracts `MessageItem` in `LiquidStream.tsx` and wraps it in `React.memo()` to prevent O(N^2) rendering bottlenecks when new messages are added to the stream.

Additionally, shifts the `new Date().toLocaleTimeString()` computation from inline during the map function to the actual state creation inside `handleSend` (by adding `timestamp` to the `Message` object type). This ensures the timestamp does not get continuously recalculated on every re-render and allows `React.memo` to successfully short-circuit.

Co-authored-by: teerthsharma <78080953+teerthsharma@users.noreply.github.com>
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