If you peek inside your /forum/includes/config.php, there's settings for vBulletin to recognize several different server caching programs.
APC, Xcache, and eAccelerator are all available this way. Ask your host which one they'd prefer to add to your site, and once they add one, edit your config.php accordingly.
Further questions should be posted on vBulletin.com in the Server Support forum, as this feature is native to vBulletin. :up:
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