There are several posts about Time Scale causing stuttering. I've used MSI Afterburner and RivaTuner Statistics Server to produce graphs of Frame Time with Time Scale set to OFF and NORMAL. Why Frame Time Analysis is important GPU Reviews: Why Frame Time Analysis is important - Introduction FPS can often be smooth, but stuttering can occur if the Frame Time increases - the same frame can be shown more than once. SETTINGS Latest Beta Track - Imola 1972 Car - One Formula Vintage Time - 5pm One lap (AI controlled driver) 1440p Maximum graphics settings except High shadows. 60 FPS Limit - The Frame Time graph should be horizonal and any spikes will be easy to see. VSync - Off I deleted d3d9.dll for these tests. This disabled DynHud which would have produced its own large spikes in Frame Time. See my post #70 in this thread: Stuttering issues - discussion & suggestions Time Scale - OFF The Frame Time is very close to 16.6666 milliseconds - what it should be. Time Scale - NORMAL Several large spikes in Frame Time. The largest are about 23 milliseconds. I haven't uploaded FPS graphs. The first test produced a very smooth 60FPS graph. The second test produced a similar graph with very slight drops. Spiking is reduced by restarting the race without returning to the main menu. The time of day seems to affect the amount of stuttering,
