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⚡ Bolt: Optimize CircularProgressBar Component#42

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google-labs-jules[bot] wants to merge 3 commits intomainfrom
bolt-optimize-circular-progress-bar-2020338481308474869
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⚡ Bolt: Optimize CircularProgressBar Component#42
google-labs-jules[bot] wants to merge 3 commits intomainfrom
bolt-optimize-circular-progress-bar-2020338481308474869

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  • 💡 What: Refactored the CircularProgressBar class component into a modern, memoized functional component.
  • 🎯 Why: The original component had two performance issues:
    1. It re-calculated expensive geometric values on every single animation frame, causing unnecessary CPU usage.
    2. It was not memoized, meaning it would re-render needlessly if its parent component updated.
  • 📊 Impact:
    • Reduces CPU work by caching geometric calculations with useMemo. These are now only computed when size-related props change, not on every frame.
    • Prevents unnecessary re-renders by wrapping the component in React.memo, improving UI performance in dynamic views.
    • Improves correctness by fixing a pre-existing bug where the animation could only handle increasing progress values. It now animates smoothly in both directions.
  • 🔬 Measurement: The performance gain can be verified by using the React DevTools profiler. In a view with multiple progress bars, the number of re-renders for this component will be significantly lower, and the render time for each will be faster due to the cached calculations.

PR created automatically by Jules for task 2020338481308474869 started by @Smensink

google-labs-jules bot and others added 3 commits December 11, 2025 10:43
Wrapped the StarRating functional component in React.memo to prevent unnecessary re-renders.

This optimization is targeted at its usage within list components like BookRow, where parent state changes would previously cause every StarRating instance to re-render, even if its props were unchanged.

This improves UI performance by reducing the number of wasted render cycles.
…7328919

⚡ Bolt: Memoize StarRating component to prevent re-renders
Refactored the class-based CircularProgressBar into a memoized
functional component using React hooks.

This optimization addresses two performance issues:
1.  Expensive geometric calculations were previously run on every animation
    frame. These are now cached with `useMemo` and are only re-computed
    when relevant props change.
2.  The component is now wrapped in `React.memo` to prevent unnecessary
    re-renders when its props have not changed.

Additionally, this change improves the component's correctness by fixing a
bug where the animation could only handle increasing progress values. It
now animates smoothly both up and down.
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