Comment 3 for bug 601093

Icons are loaded async, hence the discrepancy on startup. Gord was discussing being a bit more clever about when to show the icons (to make sure we never show empty icons).

In addition to this, we've still not had a chance to discuss if we can at least blitz all the icons we need at startup into a single file for quick loading (and also not discussed if it would actually make a startup difference for Unity :).