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⚡ Bolt: Optimize StationRow with React.memo#10

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⚡ Bolt: Optimize StationRow with React.memo#10
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bolt-perf-stationrow-memo-4779433858242369441

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@google-labs-jules

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Bolt ⚡ has optimized the StationRow component to prevent unnecessary re-renders!

💡 What

  • Wrapped StationRow in React.memo to skip re-renders when props are unchanged.
  • Refactored StationRow component interface to accept id in callbacks (e.g., onWeightChange(id, val)).
  • Updated CalculatorView to provide stable, memoized callback functions using useCallback.
  • Ensured state updates use functional setters (e.g., setWeights(prev => ...)) to keep handlers dependency-free.

🎯 Why

  • Previously, every keystroke in any input field caused the entire CalculatorView and ALL StationRow components to re-render.
  • Typing in "Pilot Weight" would re-render "Rear Passengers", "Fuel", "Baggage", etc., causing unnecessary work on the main thread.
  • This latency is noticeable on mobile devices or lower-power machines.

📊 Impact

  • Reduces re-renders of list items by (N-1) where N is the number of stations (typically 5-10).
  • Typing feels smoother and more responsive.

🔬 Measurement

  • Use React DevTools Profiler.
  • Before: Typing a character caused all StationRow components to render.
  • After: Typing a character causes only the specific StationRow being edited (and the graph) to render. Other rows remain "Memoized".

PR created automatically by Jules for task 4779433858242369441 started by @8faizahmed

Implemented React.memo for StationRow component and refactored CalculatorView
to pass stable, memoized callbacks. This significantly reduces re-renders
of the station list during input, improving performance on lower-end devices.

Optimization Details:
- Wrapped StationRow in React.memo.
- Refactored StationRow callback props to accept `id` as an argument.
- Implemented `useCallback` for all input handlers in CalculatorView.
- Used functional state updates to ensure handler stability.
- Re-introduced FUEL_DENSITY constant to maintain readability.
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vercel Bot commented Dec 17, 2025

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Project Deployment Review Updated (UTC)
stationzero Error Error Dec 17, 2025 9:20am

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