As far as I know, you don't have a choice online....Like Copter said, the default online speed is normal, which is slightly slower than '09 but slightly faster than the demo speed.
EDIT: Here you go:
Originally Posted by Ian_Cummings_EA
There are 5 options - Very Slow, Slow, Normal, Fast, and Very Fast.
Very Slow = 13% less than last year
Slow = 9% less than last year (default offline setting out of the box)
Normal = 5% less than last year (default online setting)
Fast = Same as last year (and the same as NCAA 10)
Very Fast = 5% faster than NCAA 10 / Madden 09