#2 May 06, 2008 23:48
firstly, dont get this wrong but creating duplicate threads is not a good idea..
secondly, i have no idea about a cache plugin, but if it's as you said due to 'heavy activity' i could offer you somethings that might work.. (by the way i wondered how such a big activity can cause this situation, could you ask them how much cpu percentage they allocate for each hosting ?)
try disabling trackbacks, prune your hitlog, disable your ping services and focus on the antispam central to prevent spam attacks, and may be order your robots.txt file..
these are some advices from me without much wisdom; that might work