In the LoadAccelerator.ini file, try changing this to false:
;** Better than nothing.
AutoDetectLoadingState = false
And just in case, put 60 here if you haven't already:
;** FPS limit in LoadingScreen and in Game.(0: Nolimit)
;** When you use the FPS limit in loading, GPU load will decrease, but loading time increases.
;** The optimum InLoading value depends on the environment.(350 seems good on my PC)
FPSLimitInGame = 60
FPSLimitInLoading = 350
FPSLimitInBlackLoading = 350
As a final step, you probably reviewed this already but make sure that you are not limiting anything from the Nvidia Control panel:
Vsync and fps limit must be controllable from application.
For nvidia,
- Vertical sync : Set to "Use the 3D application settings".
- Max Frame Limit : Set to "Off"