So. I tried out the win 10 pro upgrade from win 8.1 last night, just for some testing and fun
Only gfx + usb modem drivers was installed. The rest windows fixed itself
looks and feels much like win 8.1.
Used some hours of internet reading & tweaking/fine tuning OS to get as low as possible system latency to avoid input lag while gaming. A lot needs to be turned off or disabled in this OS
results
Dpc latency is ok, 5-40us but can be better. Hopefully the next months will show what to tweak in win 10 to get better system latency.
Loading times when starting fh2 or map loading seems a little faster than win 8.1 or 7
I used the same nvidia 347.09 driver for gtx 760 as I used on win 7 & 8.1 partition
Fps is very good as expected.
Alt + tab into desktop and back into game works without crashing
Latency/Ping while gaming seems more smooth/stable than win 7 & 8.1 which is the biggest positive impression I got from the new OS.