My mouse moves with delay, it's very uncomfortable. Can you help me? [switch off overlay doesn't help]

Nobody can help you with any certainty unless and until you supply details about your hardware and operating system.

When I play on gamepad, I dont have problem, so I didnt give my hardware :p

Gigabyte B85M-D3V
Intel Core i5-4460
DDRIII 8GB Kingston
WD10EZEX 1TB
GF GTX750ti 2GB
Windows 10/ 64-bit

In the game I usually have 25-40 FPS. I'm using some mods like STML or Reworked Project. Change settings to lower is
the only way to repair that problem? :) I would like to play on my current graphic settings.

I own the same graphic card, less RAM and an older processor - but there's no mouse lag.

Do you have the newest software for your mouse from the manufacturer?

What happens if you change the mouse sensivity in the options?

What happens if you take another mouse?

Have you disabled GOG Overlay? It caused and causing some lag-issues.

I've had my mouse since 2 month. It's Zowie FK1, best quality. I think that it is not fault of the mouse. I tried change my in game sensitivity and mouse DPI - didn't help. :( I tried it before and then didn't help. I've just tried it again and now is better! :) But minimal lag is still there :( Is so much better and I can withstand that detail. :)

Have you try to toggle the hardware cursor on in the graphic option?