It's an old game not optimized for multi-core or latest graphic cards.
It may not be optimised for multi-core, but can't you use the same trick as for EB1 of moving the game onto a different core to everything else?
It began on seven hills - an EB 1.1 Romani AAR with historical house-rules (now ceased) Heirs to Lysimachos - an EB 1.1 Epeiros-as-Pergamon AAR with semi-historical houserules (now ceased) Philetairos' Gift - a second EB 1.1 Epeiros-as-Pergamon AAR
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