or more radical tips you can follow

when you leave your laptop at home make a good hiding place. like the ceiling for example, most houses have their ceiling made of plywood. so make a small compartment there and no thief would no its there

second when you are in public dont be a fool and carry around a bag with the designer logo on it. in other words dont be silly and take an Asus bag with the logo still on it

third, if you are afraid of snatch theft carry your laptop on the other side of traffic...in other words if you are walking on the sidewalk and the moving traffic is to the right of you, put your laptop on your leftside of your body.