Thanks for the feedback. In my code I'm always using the time passed since the last frame for anything time-based so thats not really a problem.

I just thought maybe someone knows a way to counteract that problem. Especially the stuttering in windowed mode seemed a bit strange to me as a lot applications work very fluid in windowed mode (similar to vsync but without as much inputlag).

Does anyone know if gsync/freesync require any software specific implementation or is this a gpu & monitor only thing?