Yeah, Sided Initiative is the fastest option I've seen specifically for PBP. It just takes a good faith effort to avoid dogpiling any one PC excessively during your turn. And that's pretty easy to handle.So we almost cut waiting time in half. More importantly, players go in any order in both methods, but in the second one, they don't have to wait for a GM post before their turn, drastically cutting down on dead air. This also makes it easier on me, as I can do all the rolls I need to for the round, offense and defense, at once, instead of checking in continuously for player poposts.