I've been having a serious issue like this in both Morrowind and Oblivion. Every time I engaged in combat, hit an enemy or killed one, the game lags and freezes for a split second. Thinking nothing of it, I uninstalled Razer Game Booster and upon booting these games again, they ran without a hitch. Max settings, 1080p, 60fps (actually in the triple digits realm with vsync turn off). I won't be using Razer Game Booster EVER AGAIN. I've had this issue for months and thought it was failing hardware! In other words, if ANYONE else is having this issue and has the program installed, UNINSTALL IT NOW AND REBOOT. Hope this helps someone else as it is a pretty popular program. Runs flawlessly on 64bit Windows 10.