I play on laptop,

AMD Athlon dual-core 1,9 GHz
RAM 4 GB
Ati HD 3200

It works fine on high settings (without antialiasing) with large unit size. Though it begins to lag around ~5000 soldiers.

I've checked a few sites for info about my VGA and if I could raise the clock signal I would get a +40% better perfomance with it. However the manufacturer restricted the modding on laptops... so .