⚡ Bolt: Optimize FocusButton clock intervals to reduce re-renders#276
⚡ Bolt: Optimize FocusButton clock intervals to reduce re-renders#276google-labs-jules[bot] wants to merge 1 commit intomainfrom
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* Modified `setInterval` logic in `App.tsx`, `FocusButtonMini.tsx`, and `Skeleton.tsx` to only update the `currentTime` state when the current minute changes. * This prevents unnecessary component re-renders (59 times per minute) for always-on clock UI elements that only display hours and minutes. * Updated `bolt.md` journal with learning about optimizing `setInterval` for minute-resolution clock displays.
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💡 What: The optimization implemented
Optimized the interval logic for
FocusButtoncomponents across the application. Replaced the simplisticsetCurrentTime(new Date())call within a 1ssetIntervalwith a functional update check that only updates the state when the minute changes.🎯 Why: The performance problem it solves
The
FocusButtoncomponents only display the current time usinghours:minutes. However, their internal statecurrentTimewas updated every single second using a newDateobject reference. This caused the React component tree (includingFocusButton,FocusButtonMini, andSkeletonlayouts) to unnecessarily re-render 60 times a minute, even when the visual output did not change for 59 of those seconds.📊 Impact: Expected performance improvement
Reduces re-renders by ~98% (from 60 per minute to 1 per minute) for these clock components. Since these elements are usually globally present and always-on, this meaningfully reduces main thread CPU usage and battery drain for users keeping the app open.
🔬 Measurement: How to verify the improvement
By profiling with React DevTools while the app is idle, one can observe that the
FocusButtoncomponents no longer re-render every second. Instead, they will re-render only precisely when the minute changes on the system clock.PR created automatically by Jules for task 13763607895006225504 started by @ibsukru