The odd thing is it's irradically bad. Sometimes it's fine, but a few minutes later it takes a long time to load a page.
One thing I've noticed is that when I submit a post at times, it'll not do anything for about 30 seconds, then IE will bomb (error). Since I haven't ever used FireFox on a normal basis, I couldn't tell you how it reacts.
It's only a slight nuciance. I don't think moving it to dark-wire at this point would be worth the trouble. Plus, I don't think dark-wire supports addon domains.