Hahaha, so, here's a good one. Started a dificulty 8 dual-homeworld game. Teleport raiders and teleport battle stations. Hilariously got a gravity driller AI for one of my AI's...
That said, everything was fairly par for the course until:
For reference, the average 3-part raid wave, generally was about 900-1800 ships at this point in the game.
(Or 1800-3600... if both AI's decided to hit me at once. As they oh so love doing.)
So this CPA was seriously nothing. Well. Except a good laugh.
(If you are wondering about my excessive resource stores btw, I was preparing at the time to watch 90% of my forces die most-likely in an attack.)