Referring to: http://www.svp-team.com/forum/viewtopic.php?id=1127
So, after hearing the alleged effect of what 120FPS does on 60Hz displays from the link above, I decided to give it a try. Well, it did absolutely nothing as to what the poster described it. 5 fps scenes are still converted to 10 fps and not to 60fps regardless.
But wait, if I use madVR's Smooth Motion along with forcing 120 FPS on 60Hz display, the perceived FPS of terrible-for-SVP scenes gets better. Jitter seems to be less, too! Proving its effect however, requires a high speed camera since madVR's Smooth Motion doesn't have an encoder version for me to encode and show. madVR Smooth Motion can only be enabled when the video is playing. It's not enabled when the video is paused, so you can't tell unless the video is playing, to see whatever trick it did.
I observed that the effect is akin to how digital audio filters require the audio source to be resampled to a higher sampling rate for a better output quality. madVR's frame blender (which is what Smooth Motion does) probably blended the frames to look smoother.
For my testing, I used this video, which I downloaded the 720p version to my hard disc first (a bit NSFW). 00:50~00:53 is an example of where the effect is prominent. https://www.youtube.com/watch?v=cYcfh12tIwo
Anyone could try out what I did? See if it worked for you? This is very close to placebo, I admit. I might have to seriously try an ABX test later. Setting it up is going to be a pain though.