In my experience frame generation only feels smoother if you are already having high FPS. It you have 90-120 FPS frame generation will get you 120-150 FPS and it will feel smooth. If you are getting 40-50, it will get you 60-ish and it won’t feel good because the added input lag feels worse the less FPS you have.

Frame generation can only guess the next frame based on previous ones and motion vectors so when you do something it can’t predict (press a button) it still has to draw that normally. As I understand it because of this the input latency is going to be the same as if frame generation is off it will just look smoother.

One of the big factors for how smooth something feels is frame pacing, as opposed to raw frame rate. 60fps with steady frame pacing can feel smoother than 120fps with unsteady frame pacing.

If your hardware is struggling (ie, its capping out at ~40 fps) then there's a good chance those frames aren't coming in at a steady pace. The frame generation tech can only guess when the next frame will come in, and try to insert a frame half way through, but if that next frame comes early or late you end up with unsteady frame pacing anyway!

I'm not sure if you can cap to 30fps and then use frame generation to get you to 60 - that would certainly be a way to get steadier frame pacing.

Vsync is often the culprit of laggy feeling. I keep it off unless I get distracting screen tearing. Typically with a high enough frame rate it doesn't seem noticeable to me.

that's just the indo'