First of all, if you are using DirectAdmin in PHP-CGI (suPHP) mode, don't waste your time follow this HOW-TO. Although these steps work with PHP-CGI but you will get nothing from doing it. For PHP-CLI, I found that it help to decrease my server load from about 10 or more down to about 1 but always less than 2. (I have quad core CPU and my problem before is that CPU usage is almost always 100%.) It's useful module that you should have it installed.
Step 1 : Get XCache and uncompress it
shell> cd /tmp
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