RE: XPS 8700 - Games stuttering after upgrade
how much nVidia bloatware is installed? Win10 or Win81?
Without knowing more, my .02 would be to use RevoUninstaller and completely remove all traces of nVidia software, and then go to nvidia's driver download page and install the latest.
Only install the driver. Don't install the GeForce experience, auto updater and see how it does.