How much will the game lag?

Well I'm thinking of buying Medieval 2 Total War.

But I'm wondering if the game will lag so much that buying the game will not be worth it.

I have a laptop. It seems to fulfill the minimum requirements:

OS: ME/2000/XP, CPU: 1.5GHz, RAM: 512MB, Video: 128MB, Hard Drive: 9GB or more free space

But I'm still a little uncertain. I have a HP Pavilion dv 9700 Notebook PC.

So... If it can run the game, then I guess there will be some lagging, but How much actually? Any idea?

I just searched google for a HP Pavilion dv 9700 Notebook and I found out that the specs are 2.1GHZ Dual core, 2gb of ram and an 8600m

I'm gonna have to say that Empire Total War is going to lag incredibly even on the lowest settings. 2gb of ram on a vista OS will not cut it for this game, the processor is a little on the slow side and the video card is definetly lacking. Maybe on bare minimum settings with smaller battles you'll be able to run it.