Ive noticed performance dips in some games. I know there is an option for 8.1 in the drivers drop down but will revert to release drivers and see if its the beta nvidia driver it doesnt like. Could even be a power setting. Ill let you know.
I just checked and I was behind with a few windows updates - I delayed them because I had driver problems with my GPU last time. Updated and update seems to be going ahead normally!
I think the update does reset the Windows power plans, purely cause of the way I have my overclock voltage set (I'd changed the high performance setting to allow the CPU to downclock on idle, by default high performance prevents this and overrides all BIOS settings).
After the update the CPU was constantly running at 4.3GHz again, had to go back in and change it.
Not sure if there's a setting in Balanced etc. for graphics performance, might be worth a look.
Fingers crossed that was probably it. Windows should probably check that before it starts the update. Windows store not communicating with Windows update, how very Windows 8.
Good luck!
I just checked and I was behind with a few windows updates - I delayed them because I had driver problems with my GPU last time. Updated and update seems to be going ahead normally!