Loading time and undo time are immense for slightly bigger projects

With bigger films, currently about 3 hours, the loading time is immense of a new project. The same applies for using undo. It goes up to the point of freezing and Shotcut needing to be restarted.

What can be done about this?

Au lieu de faire un projet de 3 heures, faites 6 projets d’une demie heure.
Assemblez ensuite les 6 projets dans le projet final en utilisant ouvrir les fichiers mlt en tant que clip.

Instead of doing one 3 hour project, do 6 half hour projects.
Then assemble the 6 projects into the final project using open mlt files as clip.

For now, I am using proxies, which helps with those issues a bit. Your approach is a workaround, not a fix for huge projects. If anything, Shotcut should do what you suggested in the background without the user noticing.

BUYING BETTER HARDWARE?
I guess.

You can’t load a 4k 3hr project so quickly if you might be running something like a 16gb ram pc. That will run 4k, but not fast.
I believe that requires atleast 32-64GB ram, a RTX 3090 or 4070 super, maybe even cheaper gpu’s. And what a lot of people avoid, a fast ssd. To work smoothly, you need better hardware, otherwise everything is a workaround to achieve the same smoothness in the software.

No, the files are decreased in size for a smooth workflow, at most 520p, in general I don’t do 4K but 1080p for the final product. Also I do have the hardware you mentioned. This is an optimization issue and you do not seem to be part of the team that optimizes so be constructive or remain quiet, your tone is not welcome in my world.

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That was really not mentioned earlier, obviously most of the time the solution is upgrading hardware. Might be different in your case mate. I accept my mistake.

I do genuinely see this is a optimization issue now. However I face this when on 8k 24fps with 2-3 mins footage, 4k 60fps works fine for me at any given length under 8-9 hours. Heavy edits do surely make it lag.

My system specs are in my profile about page for anyone who wants to know. BTW, can you exactly share your system specs?

This is what you could call a “known issue” I guess. When the number of used clips in the timeline increases the app load times also increases a lot. This was slightly improved sometime in the the last few versions (I have an ongoing timelapse project with 2-300 individual pictures (yes, not sequence)) and I used to open the project from recents and just come back 10 minutes later to it. Nowadays this only takes like 2-3 minutes, still not ideal but I guess unless you’re a developer and want to help with the code the only workaround is to split the project into multiple short sub-projects as Namna suggested.

From what I’ve read the undo is tied to this load time because if the undo is too complex with multiple tracks affected it will be like a reload of the entire project instead of doing the reverse steps. I personally workaround this issue by not undo-ing but doing myself the reverse of the action (so if I cut too much of a clip and decide I want it back, I just drag the handle or copy the clip to source and change in/out there).