Resolved Need help with incredibly long playtime loading times

It takes unity +5 minutes to load an empty scene in one of the projects that I have. Everything works perfectly fine in other projects, even ones with the same version. My coworkers, working on the same project, haven't run into this issue. Unity appears unresponsive and doesn't show anything before loading playmode.

Things I've tried so far:
- Restarting Unity
- Rebooting PC
- Reinstalling Unity (2020.3.19f1, Win10 x64)
- Deleting cache within the editor
- Deleting cache manually, including registry and locallow files
- Loading other scenes
- Switching to other branches of the same project via Gitlab
- Redownloading the entire project
- Removing the library folder

It takes Unity 2979ms to enter playmode in any other project, but 389761ms (over 6 minutes) in this one.

I've found these lines in the Editor.log file, which seem relevant:
ImportAndPostprocessOutOfDateAssets: 191079.116ms (846.662ms without children)
ImportManagerImport: 184159.167ms (994.995ms without children)
ImportInProcess: 183144.233ms
UpdateCategorizedAssets: 19.939ms
PostProcessAllAssets: 5977.077ms
ReloadImportedAssets: 1.714ms
EnsureUptoDateAssetsAreRegisteredWithGuidPM: 3.280ms
InitializingProgressBar: 0.324ms
PostProcessAllAssetNotificationsAddChangedAssets: 1.285ms
OnDemandSchedulerStart: 33.025ms
RestoreLoadedAssetsState: 10.330ms

I hope someone can help me with this.

 

See pinned post in this forum and pinned posts in the Scripting forum.

 

Try if the latest 2020.3 lts improves it and use the profiler to see what takes so long

 

Thanks Kurt, didn't realize that "Editor Progress Bar stalls" was what I was looking for.

Either way, I think that my case is interesting, as other people using the same project as me, don't experience the same thing.

 

I tried a different version (2021.3.1f1 since I had that one already installed) and that didn't help. I wish I wouldn't want to switch versions, since my entire team would have to do that too.

 

The issue magically fixed itself today. I have no idea how or why, but it just works now. The only thing I did yesterday, without checking if anything changed was:

- Rebooting my PC twice, without starting the project
- Working on a different project, on the same version

It's unlikely that any of these are what fixed it, but I don't have a better guess. .-.

 

Maybe there was a driver update in yhe background as well?