Premiere Pro running slow

Hello Guys,

I have a problem with my Premiere Pro (in fact its also Photoshop, Illustrator etc.) are running very slow.
I have added a video i recorded, to show, that even the buttons are lagging completly

I also added a screen of my Taskmanager.

The forum thread about resetting the preferences is already read and done.

The CC apps are installed on an SDD.

I have no problem with other programs on my PC. Games and other apps like Unity are running fluent.

These are my speccs:

WIN 11
32GB RAM

Intel i7-7820X

Geforce RTX 2070 Super

Edit: I found out, that its way slower, when running it on my 4K Monitor.

Greetings,
Jan