Dolphin browser & Taskbar frequently hangs, locks up, since Nibia 20.2

[XRaTiX]

Alright!,but just in case,do you uninstall the user-manager-git? according to this you can uninstall it

Latte Dock randomly takes up huge amount of CPU

I highly suggest replacing all of those with their non-git equivalents. (in the case of user-manager-git it should probably just be removed - there is no equivalent as plasma-desktop already provides it.) I think you probably fell victim to this: