vBulletin 3 is a notorious ram eater. If you have less than 1 gigabyte of RAM, you're going to start noticing a higher load time (execution time will consequently increase due to a lack of resident available memory) as you exceed 100 concurrent users. Strangely enough, vBulletin 2 never encountered this sort of problem. I discussed the issue in detail on the vB.com forums if you're interested in seeing the official responses.
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