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You need to find out which page is cacheable and cache friendly (does not change frequently).
Please check response header with Firebug looking for "Cache-control", if it does not allow caching the page, then that page is not cache friendly.
As I know, vBulletin is not very cache friendly, but some pages can be forced to be cached for a little while by setting " Ignore Response Cache-Control" to yes.
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