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Sorry, won't be able to completely help you out here. Not a developer, but my guess would be what Odamex is using at the moment. If I am correct, this is running on an older version of the ZDoom engine. The old versions have been known to have serious optimization problems running on modern Macs thanks to the backend it used, something that wasn't fixed until fairly recently. This is something I could see being addressed in an update to the port. So right now, until an update for Odamex is released (if ever), your best bet is to either run the game at a lower resolution or play ZDoom/GZDoom/Zandronum.