I know a good one I found was Operation Harsh Doorstop, which is a fantastic AA game made by Drakeling Labs (owned by Connor “Bluedrake42” Hill). I hadn’t played it in a while though. An open-source option is Unvanquished, which is not a movement shooter, but I think is based upon Quake 3 with the Daemon engine. That’s what I found, though.
Um… Sweeny is just covering up the fact that his ENGINE SUCKS AT OPTIMIZATION IN GENERAL.
Sorry… had to get that off my chest.