Excessive CPU usage

Hi,
Latest version of Shotcut (24.08.29) after opening a mlt, without any other action, the CPU usage is very high, the playback is jerky.
WIN10/ i9-8950HK / 32GB
EXTERNAL SSD 10GB/S
thanks for your help

Usage excessif du processeur
Dernière version de Shotcut (24.08.29) après ouverture d’un mlt, sans aucune autre action, l’usage du processeur est très élevé, la lecture est saccadée.
WIN10/ i9-8950HK / 32Go
SSD EXTERNE 10GB/S
merci pour votre aide

Every project or just one?
If you close Shotcut and try again does it happen again?
Does it happen on a new project?
Does it happen if you open the project with a previous version?
Please try to think of things like this to help troubleshoot.
If it is an old project you have not opened in a while, it will regenerate waveforms and thumbnails.

These are indeed old projects (2024 versions of shotcut)
I don’t have any new projects with version 24.08.29 yet and the installation overwrites the previous version.
Reopening Shotcut does not solve the problem. I re-registered the mlt.
If I turn off audio waves, the problem is the same.

How long can audio wave regeneration take for a 30 minute project?
I’ll watch.
If the problem only exists on old projects.
In my work process with shotcut, I upgrade projects that I use from year to year for education… This is why I use “old edits”. I know some of them should be redone, with the new Shotcut tools, like filters on the text.

Thank you for your help.

Okay, that’s good for me. For a while old projects behave normally.
Open > processing time > save > reopen; and everything is normal

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