APC

APC, which is short for Alternative PHP Cache, is a framework used for caching the compiled source code of a script application, that can speed up a database-driven site several times. When a PHP page is accessed, the script pulls the content that should be shown from a database, parses and compiles the code, and then the result is displayed to the visitor. While this is necessary for Internet sites with regularly changing content, it's a waste of processing time and system resources for a website which does not change, such as an informational portal which displays the very same content on a regular basis. Once the webpages for such a site are compiled, APC caches them and delivers them whenever a visitor opens them. As this saves the time to obtain content from the database and to parse and compile the program code, your Internet site will load much faster. APC is very helpful particularly for scripts with larger source code.