Thread:Project:Support desk/Ressource Loader is very slow on initial visit (low traffic wiki)

On my private wikt (1 user) and on the company wiki the ResourceLoader takes ~4-5 seconds to load on the initial loading.

This is only on the first load after no traffic for a while, then browsing around is fast.


 * private wiki: MW 1.24.1, PHP 5.5.13 + Opcache
 * company wiki: MW 1.19, PHP 5.? + APC

How can this be avoided?