How do you define fast?
A quick tap and ball shoots off, ie high catapult bouncy types?
Or
The harder you smash the faster it goes?
For the first type, look for ESN produced soft pimples. Victas 102 gets rave reviews. However, soft bouncy pips may feel fast but looses high end power when smashing. The speed top out.
For the second type, classic hard pimples (hardest sponge versions of 802, 802-40, Haifu Dolphin). They are not as bouncy and may give the impression of "slow" to the uninitiated. But start smashing and you'll soon see how much more potential these have over soft springy pips.
Note, the faster it is, the worse it will be for chopping. Can't have both ways.