Update: this article is for Ubuntu Dapper Drake (6.06). If you are using later versions, or other Linux distributions, then visit the following links:
APC is a op-code cache for PHP that eliminates the parsing and compiling of script(s) for every page hit. Unlike Zend, it is truly free, and seems to have a lot of commuity momentum behind it lately.
As with all optimizations, there is a trade off. APC can use more memory on your server than without it.
The instructions below assumes that you have full control of your server, whether a physical dedicated server or a virtual private server.
Although one can always compile from source, this is more time consuming than using Debian's excellent apt-get.
Here is how I did it on two machines, with one more to go.
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