Not only should you decrease the rag dolls & corpses, but you should also decrease the screen resolution & battle size.
Even tho i have an ASUS ENGTX260, quad core & 6 gig of ram i can play the game with heaps of units & high quality, but when ever the battle finishes the game crashes, and to fix that i had to decrease all the settings and now i dont crash at the end of large battles.