Are nvidia GPUs slower on Win10 than on Win8?

[BitBustah]

I noticed that the Asus Tweak tool keeps saying I'm only using 73% of my 1080 TIs RAM memory.


Then I found this:
https://www.daz3d.com/forums/discussion/120541/windows-10-reserving-vram-update-gtx-1080-ti/



Does anyone have more info on this?
Will my 1080 Ti perform even better on Win7? Is it worth it to switch?


Edited: I connected my screen to the onboard HDMI and rebooted my system. There was a noticable increase in sols/s.
RAM went up to 78-79, but still stuck there. Any suggestions?