More shit I saw about the stuttering on a benchmark site:
QuoteResults clearly show that the game runs much better on Windows 8.1 than on Windows 7. When releasing Windows 8′s vanilla version, Microsoft announced better performance with multicore CPU’s, especially with AMD’s FX CPUs. What Microsoft said, Microsoft delivered. It is perfectly fine that new operating system brings better performance but we do not know why there is so much stuttering with Windows 7 OS. When we say stuttering we are not referring to frame drops or even Frametiming, we tested all that and it brought us nothing. We believe that Framerating techniques would show what the users and we as well have experienced, however at the time of testing we didn’t have adequate equipment to prove these claims but you can be sure that this is something we are going to be dealing with in the future.