It's probably a matter of server speed. You might be seeing pages time out before vBulletin has had a chance to calculate the whole page.
Every page brings in a heck of a lot of scripts and calls to the database server. If the webmaster has installed custom skins and extra features that require even more database lookups, then the server's workload can multiply exponentially.
We're running pretty much stock vBulletin here on a very fast, lightly loaded shared server.
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Who are all these people and what do they know? 
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