Something else is wrong with your system. I would not be looking at the processor.
If you are running Windows 7, that is a problem as it is not supported on 7th gen processors. If you need to run Windows 7, get a 6th gen processor.
Only windows 10 is supported on 7th gen and later processors.
Try using a supported environment before blaming the processor for performance problems. As of right now, you are not supported.
Also, keep the language clean. Read the House Rules
Lastly, if you paid 3500 euros for the processor, you were robbed:
What the system cost is another issue.