Windows 11 extreme slowness navigationg Virtual folder

Hello everyone!
I just installed my NextCloud Windows 11 client 3.4.1 (windows-10.0.22000) in my laptop. I can see that it can leverage “virtual folders/files”, which I enabled.

Since then, every NextCloud folder opening, every file selection, contextual menu opening, ends up with Explorer freezing for ~15", which makes browsing impossible. Switched back to old Win10 explorer without change.

Does some of you have the same problem? Did you have clues to solve/circumvent it?