Movement Speed

Flash Jump was tested with 100/100 and 140/120, and the difference for Instant Flash Jump was practically non-existant. Jag Jump was tested with 160/100 and 180/100 for obvious reasons. I could not test 210/100 because you did not get skill books in Tespia, but there was very little difference between 160/100 and 180/100 to begin with, I would expect the difference to be less than 10% speed overall. Every other skill was tested with 100/100 because those classes do not get any speed bonuses. I can check 140/120 or 140/123 with an Aran eventually, but speed does not affect Momentum Combat Step at all, only walking Combat Step.

For Teleport, the actual testing becomes difficult because of the set number of Teleports that can be done on a flat map. Depending on the level and amount of speed you have, it varies when you hit the wall with the last Teleport so some error has to be accounted for. For example, I believe with maxed Teleport on a Magician, you will need to walk for the last whole second or something because the wall becomes too close for you to Teleport the final distance.

For what I've experienced on my aran is that Momentum Combat Step is quite a bit faster with 140% speed than with 100% speed or something. I'll go test it a bit later today. Jump is a killer for Momentum Combat Step for what I know. I'm trying to get 140/100 or 140/105 on my own aran just to Momentum Combat Step faster. Would be a bugger if it doesn't work at all.

EDIT: Okay, odd. My Momentum Combat Step with 100/100 is around 1 second slower then your results, but my 100/100 walking is exactly the same. I blame lag or some change in Combat Step in KMS, as this is tested on EMS.
My results (only Momentum Combat Step):
100/100: 5.77s
135/105: 5.74s
130/100: 5.62s

Yea... It seems that speed is indeed extremely unimportant for Momentum Combat Step =/