It seems like this happens after I use CTRL+ Z in the VAB or SPH. Once the stutter begins, the vessel I was building will cause it even worse while active, and the stutter never ever ever goes away, it only gets worse the more often I use CTRL + Z. Reloading sometimes solves the problem for a short time, but it returns soon . It is far worse with KER, KIS and probably some others.
Does anyone know why this happens and how I can fix it? (I don't want to reinstall my game yet again, because I've finally gotten somewhere and stopped derping around.)
Windows 10 x64
x64 game no mods for this particular complaint
EVGA GTX 980ti
Core i7-4770k
16gb RAM
Tank you!!