Trouble running old Total War Games

[Poseidon45]

Ok so i recently got a new gaming computer from iBuypower and it runs shogun 2 like a dream, i tested with over 30,000 units and still had no lag, although the game itself stuttered a bit. But when i went on games such as rome total war and medieval 2 total war all of a sudden i couldn't support even 9,000 units on at once without extreme and unplayable lag. Any help would be appreciated thanks in advance. (i hope)

[Poseidon45]

Can a moderator please close this thread