Game not running as smooth as it should

[Super-noob]

Hello!

I just newly installed the game again with the latest patches, but I have a problem with performance. My current specs are:

Windows 8

Nvidia Gefore 640m LE 2 GB which I have clocked a little. Should give 10-40% performance boost depending on the game.

Intel I7 3630QM 2.40 GHZ

Memory ram 8 GB.

I don't have any really demanding settings. Shadows off, AA4x, Anisotropic 2X, everything on LOW except for huge on unit size, high details for unit and texture quality. Even though I just have 1000-2000 units on screen it is not running smoothly. Especially in a city.

I have two GPU (a bad one, and the Geforce 640m) I tried running the game by presetting the 640m but I just got a lot of artifacts for some reason?

Edit: The loading speed is fine, the battle campaign map runs fine it's only during battle.

Shouldn't the game, considering my settings and unit size run smoothly? Even with a lot more of units, right? What can I do to help this? I really wanna enjoy the game to the fullest.

[Gigantus]

except for huge on unit size, high details for unit and texture quality

All of this is killing your performance, reduce the last two step by step and try.