Decided to test 4.13 and 4.13 v2.
4.13 works well, Win resource monitor shows ~50% GPU utilization regardless of the video resolution. I tested with 720p and 1080p videos at 60 Hz. Shouldn't there be some sort of difference between 720p and 1080p? 720p even reaches 60% more often on my RTX 4080. Also, the 4.9 model included with SPV by default now has almost the same performance, mostly sitting at ~50% regardless of resolution.
4.13 v2 doesn't seem to be working, however. Every time I try to play a video, it compiles the cache file and after around 50 seconds it stops and the video plays without RIFE. Can't really see if it gives an error cuz the window closes fast.