impossible that it is related to vBulletin itself (a slight chance it is a plugin)... or your host have a 3 or 4 years old server... maybe it is time to move to something efficient...
and it is not because i am a fan... i am not... i just know that these excuses of poor code are always related to outdated configurations.. they may even offer you to upgrade to a higher service you would pay for....
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