So far then you guys are using only one roll for the entire encounter and simply repeating the order every round?
It depends on the players. I have one player who is a damn near genius. If we don't shuffle initiative and I don't do anything crazy with the NPCs and he can predict the other players actions then by the end of the first round he can pretty have the entire encounter resolved in his head.
I can see how that might save *some* time, but it's still going to slow the game down a little bit, as the person tracking the initiative will still have to call for everyone's new initiative rolls at the start of each round and then reorganize the list, which is slower than just saying, "OK, new round, back to the top, X is up." And we may be talking seconds here, rather than minutes, but they still add up over the course of a session.Rolling every round takes virtually no time if you do it right. We have one person track initiative. When a person is done with his turn, he is asked to roll for the next round while the next player it taking his turn. By the time you get to the last player, that player is the only one who has not rolled yet and it takes all of about 2 seconds to roll and get his initiative.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.