Nintendo Maniac 64
Ok. It really needs to be explaned.
In case of double framerate (24>48) you have frames at output: Source, interpolated, Source, interpolated... and so on.
Interpolation artifacts are situated in the interpolated frames only.
So if SVP algorithm produces say 100 points of artifacts at every interpolated frame then you will see 0, 100, 0 ,100 and so on. It is in average only 50 points.
Now about triple framerate (24>72). At output will be: Source, interpolated1, interpolated2, Source, interpolated1, interpolated2... and so on.
But these interpolated frames are situated closely to source frames than in case of double framerate.
Double framerate = 1 inteprolated just inbetween source frames (+50% of MV length) = so it has maximum artifacts = 100 points.
Triple framerate = 2 inteprolated inbetween source frames (-33% and +33% of MV length) = so it has maximum artifacts = 66 points (or even 50 points - who knows the real formula? 
).
If take 66 points at every interpolated frame then in average it can be 0, 66, 66, 0, 66, 66 = 132/3 = 43 points
If take 50 points at every interpolated frame then in average it can be 0, 50, 50, 0, 50, 50 = 100/3 = 33 points
So. Visibility of artifacts (in average artifacts points) will be less while triple framerate.
