in macOS mojave apps freezes and beachball appears for some seconds when doing tasks like loading a conversation in Messages
macOS 10.14.6 on my MacBook Pro early 2015 13" with an i7 and 16GB Ram the active app freezes for some seconds when doing tasks in it, like loading conversation in Messages (happens not on every conversations, more like.. every fifth or sixth I click), clicking into Address Bar in Safari or calling up the context menu and I can't figure out why this happens. It happens at any time, means right after a restart.
It existed before the 10.14.6 update.
I uninstalled a clipboard manager which I use and thought it could have sth. to do with it... still existing.
I always look and try to figure it out via Activity Monitor, but no clues.
I booted into Safe Mode... still existing.
I reinstalled macOS via Recovery Mode... still existing.
I also tested my RAM with a memtest86 boot stick. Nothing.
My guess is it would still be present when I recover from a backup... are there any other clues or things I can try to figure this out without installing everything from scratch? Help would be much appreciated. Thanks in advance.
MacBook Pro 13", macOS 10.14