Loading and unloading the game improved for me... turns on a medium map against 5 AIs on normal got boggy around AC 187 or so, but not consistently from turn to turn (sorry, Leo in Wis.
, it sounds unscientific). Tactical battle animations are more fluid and the new way Amarians get their shard boni is much cleaner.
I have noticed multiple Arenas of the Slakhanan? on the map...