We moved our vBulletin installation to DreamHost from 1and1 because, although we had scads of disk space, 1and1 limited us to only 100mb of mysql space. It only took us about 5 months to get to the point that we had to start purging messages.
We're on DH shared hosting plan, Level 3 (60gb disk space, 1.6 Tb bandwidth).
We've been running a little over a week, and DH is complaining about our CPU usage, something we never heard from 1and1 with a similar installation. They say we're using 140 cpu min/day, and they'd like us to get it down under 60.
I received this comment and suggestion from DH support:
So if any of you who 'have been able to get [vBulletin] within acceptable CPU limits' are out there, I'd be extremely grateful for any help you can throw my way.
Administrator, Timeshare Users Group BBS