Since everyone else is hung up about the name...

German component words aren't that hard if you break them up:
Geschwindigkeitsbegrenzungencoin
Geschwindigkeits begrenzungen coin
Geschwindigkeits = speed
begrenzungen = limits

Oh of course that well known German word (not) coin, but Geschwindigkeitsbegrenzungenmünze would be even longer. Also, coin is useful since the plural would be coins whereas for Münze it is Münzen which would confuse people even more.

But anyway, back to the OP: how does being more memory intensive tie in with the Geschwindigkeitsbegrenzungen? Is the speed limit meant to refer to only the speed it can be mined at? Because to me, a speed limit would imply maybe a limit on the speed of transactions (sort of the opposite what we want from a useful coin).