It is a bit too slow for me, I find it hard to keep track of what has happened between posts. I don't mind multiple forums, I am in or run games in several right now. My suspicion is the format (mega-dungeon style with lots of options at each turn) coupled with player-only mapping slowed things down quite a bit - don't get me wrong - riftstone's maps are _awesome_, but at least for me I find PbP flows better when the ref posts smaller, inline maps as the game progresses. That way I can read back through the posts and see what has happened and where the party is relatively quickly. More work for the ref for sure, but easier for the players to catch up after a few days off.
[f=4]Orim the Dwarf Fighter (M 9" AC 6/6 HD 1+2 hp 7/7 FC Man+1) leather+helm, spear, hand axe[/f]
the Cleric (M 6" AC 2/3 HD 2 hp 9/9) plate+shield+helm, war hammer, sling[/f]