It's about the same speed. IIRC just a hair slower than the highest level Sow spell.
Edit: When I played and was applying for a quild, they required Run3, I didn't want to get it because I was playing a beastlord and could cast sow. They said it's because they raid indoors very often, so you can't use sow. But, I did LDON missions until I saved up enough points for Pack Shrew, and since that works indoors, I still haven't bothered getting Run3 yet. Plan to though, just for the extra spell slot.
Edited, Wed Jan 28 10:57:11 2004 by Skeeter