Mm, so when you have more weight, you slow down, right? And you cannot just get around that by having more power? That is too bad, as it'd be amusing if, at some point, you could power a suit enough that it could be massively heavy whilst still able to move extremely fast.... For a few minutes at least before you were forced to move at speeds snails would find offensive.
You can go above the 25kg weight limit and use the legs to give yourself haste, but it'll lower your base speed. So the going beyond that power storage means you sacrifice mobility. You could chose to do that, I don't. I use Xeno's Reliquary wraith eyes and nodes at my dimensional entry points as a way to conserve power and provide an emergency out. I have a portal gun now too, so I can use that.
MPS's recent versions have a ton of balancing work. You must give up some mobility on land to have something as durable as a gravity suit as I see it right now.[DOUBLEPOST=1361992464][/DOUBLEPOST]
However MPS still can't compete with speed of quantum leggings on ice, you can even add speed potion for extra HAYO. I don't think there is any faster way to travel, excluding teleportation.
This is a layer cake of not true, iced with misconceptions. I'll let you join my server, give you anything you want, and we'll race. If you can outrun my MPS with your gravity suit I'll give you a gilded silver internet. As far as I know, the gating factor on my system's speed is my server's ability to generate new chunks.