midgard_config::open_config is slow #116
Description
I recently did some profiling on openpsa requests with Cachegrind and to my surprise, it turned out that the single most expensive function called is usually midgard_config::open_config(). for example, in AJAX requests, where there is not much going on in the framework level (no navgiation rendering, only very simple styling), open_config accounts for more than 80% of the total request time. In normal requests, open_config uses 30 - 50% of the total time.
This was tested in a VM on Ubuntu 13.04 with PHP 5.5.3 with a MySQL database running locally (using gda5). Unfortunately, in Cachegrind, I cannot see what happens inside of open_config(), so I was wondering: Is there any way to find out what is taking so much time? Also, is there any way to speed this up?