Adding to what others are saying: having a relatively high fps to start with helps frame gen work better:
the difference between the real frames is smaller so the interpolation result is better
the generated fake frames are shown for less time (120fps = 8ms per frame) so errors are harder to spot
the perceived latency is reduced since generating two real frames (to add one between) takes less time
For these reasons, frame gen works best for those who already have a high base fps. I use it take advantage of 4k 240hz monitor in visually rich single player experiences. I aim for 70-90 base fps and then double it with frame gen. For competitive multiplayer I disable it.
Adding to what others are saying: having a relatively high fps to start with helps frame gen work better:
For these reasons, frame gen works best for those who already have a high base fps. I use it take advantage of 4k 240hz monitor in visually rich single player experiences. I aim for 70-90 base fps and then double it with frame gen. For competitive multiplayer I disable it.