Speed can vary depending on a number of factors, I found the best results occur when using Memcache. You could turn on vBulletin debug information to check page generation times, this is my forums normal generation time (forum home):
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Page Generation 0.08814 seconds
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This is simply a test forum, no mods but vB Optimise, my server also has XCache installed, when I turn vB Optimise on:
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Page Generation 0.02804 seconds
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Not to mention the reduction in two queries and a chunk off another