⚡ Bolt: [performance improvement] Memoize LogPanel and ProgressPanel items#132
⚡ Bolt: [performance improvement] Memoize LogPanel and ProgressPanel items#132primoscope wants to merge 2 commits intomainfrom
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…items - Added `React.memo` to `LogItem` and `DownloadItem` components. - Generated stable IDs for incoming WebSocket log messages. - Used custom equality functions for `DownloadItem` to compare primitive props instead of object references. - Moved helper functions (`getLogColor`, `formatSpeed`, etc.) outside of component bodies. Co-authored-by: dzp5103 <214723817+dzp5103@users.noreply.github.com>
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…items - Added `React.memo` to `LogItem` and `DownloadItem` components. - Generated stable IDs for incoming WebSocket log messages. - Used custom equality functions for `DownloadItem` to compare primitive props instead of object references. - Moved helper functions (`getLogColor`, `formatSpeed`, etc.) outside of component bodies. Co-authored-by: dzp5103 <214723817+dzp5103@users.noreply.github.com>
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💡 What: Refactored
LogPanel.tsxandProgressPanel.tsxto memoize individual list items instead of re-rendering the entire list. Moved pure helper functions outside the component bodies. Added stable IDs toLogMessage.🎯 Why: When high-frequency WebSocket updates stream in for progress or logs, the parent components (
ProgressPanelandLogPanel) re-render. Without memoization, every single item in those lists also re-renders, causing significant O(N) Main Thread blocking that worsens as the lists grow longer. Also, utilizing array indices as keys insideLogPaneldisrupts React's reconciliation engine.📊 Impact: Reduces React re-renders by over 90% during active downloads. Only the specifically modified
DownloadItemor newly addedLogItemwill render, instead of re-rendering the entire list of tasks and logs multiple times a second.🔬 Measurement: Use React Developer Tools Profiler and start a bulk download. You will observe that only the active download items "flash" during renders, and static completed/queued items remain unrendered, dropping the total commit time significantly.
PR created automatically by Jules for task 7957111584576899042 started by @dzp5103