There are lots of questions about uninterruptible power supplies that are <del>improperly</del> tagged as [tag:apc] There also questions about web application performance and the [Pecl PHP opcode caching][1] package, [APC][2], tagged as [tag:apc] I'm suggesting a new tag [tag:php-apc] then do a merge and create another new tag [tag:apc-ups] [1]: http://pecl.php.net/package/APC [2]: http://php.net/manual/en/book.apc.php