What problem does this solve?
Description:
Opening a tab with a large number of tracks (2500+) causes significant UI lag and high CPU usage. The application becomes unresponsive for several seconds, which negatively impacts user experience.
Steps to reproduce:
- Open the application
- Open a tab in sidebar containing ~2500 tracks
- Wait for the list to render
Expected behavior:
- UI remains responsive
- Smooth scrolling
- CPU usage stays within reasonable limits
Actual behavior:
- UI freezes for a few seconds
- Mouse movements are delayed
- Scrolling is laggy
- CPU usage spikes up to ~40%
Environment:
OS: Windows 10 22H2
CPU: i5-4690k
RAM: 16GB
App version: 1.3.5
Additional info:
- Issue is reproducible consistently
- Likely related to rendering large lists without virtualization
Priority: Medium / High
High CPU usage observed in renderer process (based on DevTools)
Performance profile:
Attached Chrome DevTools performance recording (.json)
Trace-20260401T120829.zip
Proposed solution
Technical observations:
- The list renders ~2500 items at once
- High CPU usage observed in renderer process
- Possible heavy main-thread blocking during render
- Potential excessive re-renders of list items
Hypothesis:
- Inefficient rendering strategy
- Heavy synchronous processing on main thread
- Possible IPC overhead when passing large datasets
Additional observation:
CPU usage drops significantly when the application window is minimized.
Implication:
This suggests that the performance issue is likely related to renderer activity (rendering, animations, or frequent UI updates), rather than background processing.
Possible causes:
- Frequent re-renders or render loop
- Heavy layout/paint due to large number of DOM nodes
- Missing list virtualization
- Active timers or polling logic throttled when app is minimized
Alternatives considered
No response
Platform relevance
Desktop only (Windows / macOS / Linux)
What problem does this solve?
Description:
Opening a tab with a large number of tracks (2500+) causes significant UI lag and high CPU usage. The application becomes unresponsive for several seconds, which negatively impacts user experience.
Steps to reproduce:
Expected behavior:
Actual behavior:
Environment:
OS: Windows 10 22H2
CPU: i5-4690k
RAM: 16GB
App version: 1.3.5
Additional info:
Priority: Medium / High
High CPU usage observed in renderer process (based on DevTools)
Performance profile:
Attached Chrome DevTools performance recording (.json)
Trace-20260401T120829.zip
Proposed solution
Technical observations:
Hypothesis:
Additional observation:
CPU usage drops significantly when the application window is minimized.
Implication:
This suggests that the performance issue is likely related to renderer activity (rendering, animations, or frequent UI updates), rather than background processing.
Possible causes:
Alternatives considered
No response
Platform relevance
Desktop only (Windows / macOS / Linux)