I would suspect either you do not have sufficient RAM (too many programs running at once or in the background) especially if you are running windows 7. Otherwise it may simply be your internet connection that is stuttering.
There are too many variables. It could be the internet connection, or the software you are using. But 5 fps in furmark is quite bad, it may show the problem is your gpu. Try testing it under heavy load, and see if the temperatures go higher. If it does, your gpu could be damaged by overheating. Lower the resolution and ingame graphic options, and check again. Anyway, i'd never recommend a laptop for gaming... They tend to be problematic, especially with overheating.