This is an example of how to increase performance in an extremely simple way.
We use here INI encoded files which are read and turned into arrays (via
parse_ini_file()), and that in itself is simple. The extremely simple way to increase performance is to use
var_export() to save that array to a file and then use that file directly. For a system with just one or two small INI files any increase in performance will be unmeasurable, but this idea is very valuable indeed if there are large amounts of data/files and large amounts of requests.
Performance basically doubles immediately. It would take the same time to read the files (they will be about the same size), but a PHP array is parsed natively by PHP as code, while the INI file has to be converted to a PHP array.