The Due is 10x faster isn't it??
EDIT: Whoops yeah, got 8Mhz in my board.
The arduino UNO has no FPU so if the Due processor has one, it'll beat it hands down, EDIT: has none but there must be some fancy new way of dealing with them that the atmeaga doesn't have.
It would be able to control multiple FP external chips easily I'd imagine.