Ctrl + F, Cmd + F is not quick find. It's Enter Find Mode.
Have you compared them one to one on Mac vs Win? Same field(s), same query?
Yes, I know Ctrl + F, Cmd + F is not the quick find commands. there is a few seconds lag between Ctrl + F before you can click on the field you want to enter text for your search - this is not the case on the Mac - its instant on the mac.
On Windows its seems to be very sluggish - this is not just on one PC it is one several.
Ctrl+F works fine on my Windows 10 pc.