I'm designing a build based around getting as many shots in a short space of time as possible, so obviously trying to figure out the fastest bow (actual damage is irrelevant in this case, arrows are being used as a poison delivery mechanism only.) I'm going around in circles trying to figure out what the fastest bow is: some people say Bound Bow, others Zephyr, I've seen an argument for Froki's Bow...

Does anyone know what the fastest bow is (or if there are several at the same speed)? Thanks.

Froki's (an enchanted long bow), the long bow, the Zephyr, and Auriel's all tie for fastest.

http://uesp.net/wiki/Skyrim:Archery

Further down in the page is a list of all bows. The list can be sorted by weight, speed, etc.

The forsworn bow is pretty quick as well.