https://bugs.kde.org/show_bug.cgi?id=513263
Bug ID: 513263
Summary: Timeline navigation becomes slow with 800+ clips
Classification: Applications
Product: kdenlive
Version First 25.11.80
Reported In:
Platform: Ubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Timeline & Editing
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
Timeline navigation becomes noticeably slow when the number of clips reaches
~800 or more.
Scrolling and zooming the timeline lag, making editing uncomfortable even
without effects,
transitions, or animations.
STEPS TO REPRODUCE
1. Create a project with long footage (e.g. ~1.5 hours) on two video tracks
with two synced audio tracks.
2. Perform extensive cutting to remove unwanted parts until the timeline
contains ~800–1000 individual clips.
3. Try scrolling horizontally and zooming in/out on the timeline, especially
during playback.
OBSERVED RESULT
- Timeline scrolling becomes sluggish.
- Timeline zooming lags and feels delayed/step-based.
- While playback is running, scroll and zoom responsiveness degrades further.
- The UI remains functional, but navigation becomes uncomfortable and slow.
- System resources (CPU/GPU/RAM) are not fully utilized.
EXPECTED RESULT
Timeline scrolling and zooming should remain responsive with hundreds of clips,
especially during basic rough-cut workflows without effects or compositing.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu 24.04 (Wayland, GNOME)
KDE Plasma Version: N/A
ADDITIONAL INFORMATION
- I will provide a download link to the project file so the issue can be
reproduced directly.
- Actual Kdenlive version: 25.11.70
- Project link download:
https://drive.google.com/file/d/1bXhkKy3dZVdrqdJYDd5acxvI1uIT6S2F/view?usp=drive_link
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