xcache is preferred over apc and out performs.
with a 3600 timeout, you wont get emails thats for sure lol
with the amount of users you have online in the forums, i dont see why you would be caring that large of a server load, there is something else going on, but logs will help you in finding that out, you might also want to start a strace on large cpu or ram pids and find out what they are doing to use up so much resources.
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