A Reddit thread reporting the issue described Deus Ex: Human Revolution and S.T.A.L.K.E.R.: Call of Pripyat as "close to unplayable" as a result. Apparently Call of Duty games and Metro 2033 are affected as well.Full details and a temporary fix can be found at Reddit.
It's only video games that don't use Raw Input for reading mouse movements that are in trouble. Something has changed in the way Windows updates pointer positions and that's what is apparently causing the problems.
Windows 8.1 gamers complaining of mouse lag
Posted on Wednesday, October 23 2013 @ 11:10 CEST by Thomas De Maesschalck