Linux user (so SI probably doesn't care too much about my issue, since it's not a supported OS), but gameplay on FM22 is smooth and FM23 was completely smooth until the most recent patch. I've tried the fixes listed here, including making all the signage black/red, but the 2D and 3D gameplay is still stuttering. For some reason is does become smooth whenever I open settings window for camera type, game speed, etc., not sure why that's the case.