Most likely what you are running into is the maxclients limit on your httpd.conf, doubt that your default kernel maxusers var is affecting you. You need to bump that up while monitoring your server-status page to make sure that your server can take the extra load, otherwise you overload, sites still slow to crawl, and depending on what happens next you can also possibly run out of swap and have your server crash.
If you want some more details hit me up on icq at 36837470.
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Take Luck!
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