I checked all processes with the Task Manager and closed all background processes except the basic processes with no changes on the gpu usage and fps. You think it's related with my cpu?
I do not think so. If you were having problems with the CPU, you would not be able to play games properly. Have you tried reinstalling Windows 10 with an USB stick?
I would try these if I were you...
+ I'd reinstall Windows 10 with an USB stick.
+ I'd install the driver.
+ I'd test the clean system again with the Userbenchmark website.
+ I'd check if the performance of the processor and the graphics card is average.
+ If I don't have performance issues, I would try the game I'm having problems with.
So... I would try to find out what the performance issue was.
If the clean system causes performance problems despite the new installation, the installed drivers, disks, USB devices should be removed one by one and the system should be emptied so that only the most necessary hardware is left and tested.
Ok I solve the problem. The problem was a different startmenu I installed, because I don't like the ordinary Windows 10 startmenu. I delete the startmenu and my gpu usage and my fps are higher than before. Thanks for your help.