I'm not worried about me (enhancements in play), I'm concerned that AI opponents(e.g. Rommel) are not in play. The warning is just for AI opponents.
Viewing post in AI player not optimized!
What this is telling you is that the Player Type (Expanding AI, Enhanced AI, etc.) does not have a correctly matched script. Since you have a mismatch here, the computer will play at a Classic AI level. It doesn't mean that your opponents will play like dead bugs. Of course, you could argue that the Classic AI does play like dead bugs. :)