I have an Acer Aspire 5750G laptop.
Intel Core i5 2.30 GHz
4 Gb RAM
500 Gb HDD
NVidia Geforce 540M
Football Manager 2012 runs perfectly. I only select 4 leagues when I play and the graphics rating is like 3.5 or 4 stars. No lags at all.
This happened to me when I coached Man United, in my older save file. What I did was, I rested everybody for 1 week from training. They won't train for a week, but their condition remains high. Only their fitness goes down.