Just felt like doing some math to demonstrate the level of speed a berserker can attain and how the slightest speed increase can be exponentially useful.

X=Base Move Time

Ceiling(.4/X)=Number of moves you get per turn

Ceiling(.4/X)*X-.4=Length of turn

Ceiling(.4/X)/(Ceiling(.4/X)*X-.4)=Moves per second (mps)

If 1>X>.41, 1.66<mps<100

If .39>X>.21, 5.26<mps<100

If .19>X>.14, 17.65<mps<150

If .13>X>.11, 33.33<mps<100

Not entirely sure what happens when X=.4,.2,.133333333, or .1 exactly.

I think you either go up to the next number of moves and your turn takes X seconds, or your next turn starts instantly and you get an endless succession of zero second turns leading to infinite moves per second.

Note that this function for mps is not continuous. Having more moves per turn will always help you conserve berserk time (because it's measured in turns and not seconds), but a slower base move speed could give you shorter turns and unintuitively increase your actual move speed.

Might find the first derivative for each continuous part of the function, later. But now this one needs sleep.