Desktop lag on "powerfull pc"

Goodmorning everyone.
I am a new clear linux user.
Here are my machine specifications:

Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Address sizes: 43 bits physical, 48 bits virtual
Byte Order: Little Endian
CPU(s): 48
On-line CPU(s) list: 0-47
Vendor ID: AuthenticAMD
Model name: AMD Ryzen Threadripper 3960X 24-Core Processor
CPU family: 23
Model: 49
And a 2060 nvidia super

I have already successfully installed the proprietary nvidia drivers as found in the clearlinux help.

My problem is that “the desktop” seems to be lagging. It seems less fluid than the linux distribution I had before on the pc (manjaro).
I have already tried switching from gnome to kde. But the problem persists.
Every now and then I see that chrome “lagga”. That windows are not as responsive as I used to with manjaro.
Which configuration should I go to modify?

Does dmesg or journalctl give any hints about where the problem may be?

thx. this is my dmesg