This was never my experience. When I ran 3e we always started campaigns at 1st level. Even people who were playing basically the same character as they did last campaign took forever if they were playing certain classes and employing certain strategies. It just takes time to resolve all the actions and change all the numbers once high level magic comes into play.One possibility that just occurred to me: Might it be that, in general, people's turns take longer with characters who were created at high level than with characters who worked their way up (and thus had time to master their tactical options one at a time)?