Ground unit speed is not quite what CBT units get but close enough, CBT fighters have been reduced from what they can do.
Here's what the game is going to alow them to do and what they can do in CBT. Now im not saying that CBT fighters should have a incress in speed to match what thy can do in CBT. This is just a compairison. (Note the first CBT number is their low altitued speeds)
Sparrow Hawk H5
MWLL: 400 to 600kph
CBT: 3,600kph (16,200kph at 90km altitued)
CSR V-12 Corsair
MWLL: 240 to 360kph
CBT: 2,160kph (12,960kph at 72km altitued)
SHV-O Shiva
MWLL: 200 to 320kph
CBT: 1,800kph (10,800kph at 72km altitued)
Sulla
MWLL: 400 to 600kph
CBT: 3,240kph (16,200kph at 90km altitued)
Visigoth
MWLL: 240 to 360kph
CBT: 2,520kph (14,700kph at 90km altitued)
Xerxes
MWLL: 240 to 360kph
CBT: 2,160kph (12,960kph at 72km altitued)
Now if CBT fighters had this speed in MWLL, as a ground pounder I would be worried about trying to hit them... (some of them reach Mach 2.94 at sea level).
Not to mention the kind of stress on the game engine it self... Though 600kph is good enough to represent a ground attack speed.
FYI at low altitudes (using the fighter scale rules) each hex traveled equals a speed of 180kph, at higher altitudes and in space it's 1,080kph (when in an atmosphere there is an over all limit of 15 hexes per turn)
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Edit:
I think I just relised what he was worried about
In MWLL they not only reduced the speed of the fighters but of the mechs as well.
Example
Marauder
MWLL top speed 55kph
CBT top speed 64kph (it's realy 86kph with sprinting rules)
Though amusingly some of the Tanks got a speed incress (the demolishers CBT speed is 54/65kph in MWLL it's 70kph).