I don't know.. In the DnD rp that I once was (damn regret my lack of mechanics knowledge), things progressed rather good. Some posts we were traveling, others fighting, some others resting etc. 
Here though, 70% we're talking(god everyone loves fluff) and 30%fighting. And the posts for each are written as if we're actually there, 1 Long post= 1 minute in Rp time. This is super bad for character development, something most wanted to do, like teaching their character sword fighting or magic. So the slow progression is a problem that should be fixed.

These are some reasons most participants here feel that are responsible for the slow rp and that should be fixed.

I on the other hand am fine, I like it as it is.