Hi. I know the thread is a bit old, but about the performance stars system...
First of all, only playable leagues, the database size and the lower active league on the playable leagues seem to matter. Go ahead and try loading 20 view-only leagues, and you'll see the ratings don't change.
Second, as my video card has burned up and I'm using an onboard one, it gives me a ridiculous computer performance of half a star. I'm pretty sure if I put in a decent video card, the estimated speed will go up, even though the processor will stay the same. My PC is not that crappy to get only half a star (I could run Crysis pretty well before my video card went bust).
What I recommend is loading only one (or two, at most) playable leagues with just two or three divisions and a small database (or one division and a medium database), and a few view-only leagues you may want. And, in my case, I've disabled the 3D stuff in the settings (I've actually disabled Direct3D altogether on my system). I say do as you like, and just start over if you find it too slow. I wouldn't buy a new laptop just because of that, though.
I don't find it too slow here. I used to play FM 2008 and my PC was a piece of junk back then, it was a lot slower. Plus, you can always watch TV, listen to music or read a book as you play =P (H). Cheers.