If you game on multiple monitors and have noticed problems recently, with screens rendering with off clipping or not a timely manner you may want to look to Microsoft.  It seems that KB3213986 which was released yesterday, may well be to blame.  As there are no serious security updates contained in this particular patch you can feel safe uninstalling it, unless you really need two keyboards and a fingerprint touchscreen attached to your system.  Cheers to The Guru of 3D for posting this first.

"Users may experience delayed or clipped screens while running 3D rendering apps (such as games) on systems with more than one monitor."

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