APC (PHP Opcode Cache)

Alternative PHP Cache, or APC, is a module for Apache servers which is employed to cache the output code of script applications. It is very useful for scripts with large source code and will boost such a site as much as three times. PHP sites are dynamic and every time a visitor accesses a web page, the script hooks up to a database in order to retrieve some content, and then the code is parsed and compiled prior to it being shown to the site visitor. If the output code does not change however, that's the case with Internet sites that show the exact same content all of the time, such actions trigger excessive reading and writing. What APC does is that it caches the previously compiled code and delivers it each time visitors browse a website, so the database does not have to be accessed and the code does not need to be parsed and compiled repeatedly, which consequently decreases the website loading time. The module could be really useful for informational Internet sites, blogs, portfolios, etcetera.