My old-ish laptop that I ran LFS with before my desktop was a Lenovo G500s with Intel Pentinum and 2gb ddr3 RAM, quite low sec graphic card and fully stock.
It handled LFS alright with at (if I recall) 70fps max 30fps avg with graphics turned down besides shadows. These laptops can run LFS decently already as they are, but may lag a bit more at detailed tracks like Westhill or Blackwood.
On the other hand, I also had a spare laptop to the Lenovo that was even older, a HP Probook or Elitebook (can't remember) with a very basic Intel duo Core, 2gb RAM and shitty AMD graphics. That one barely got 30fps, hovering at 18fps most of the time with all graphics down including no shadows.