Yes, laptops do lag quite badly in some situations. I know I do. (Referring to the stupid moment where my old laptop died and then I gave a rant about not to use one and then went and bought another. .W.)
Anyways, do you have Bro's HD Pack and stuff? Sometimes that can cause lag, like the Christmas Update WILL cause lag on a laptop if you have it.
If you do, there's a specific way of lagging it down a bit. :3