This sounds like a Networking issue to me, but I'll try to help you before the topic gets moved.
Do you connect to the internet wirelessly, through ethernet, or with dial-up?
If you are connected wirelessly, how far away are you from the base? Also - did you install the Airport Extreme wireless card yourself, or did it come pre-installed for you?
Have you tried using another browser (Firefox, Opera, etc)? If so, does the same problem occur?
To me, it sounds like you're surfing wirelessly and that you may be too far from the base station - receiving low signals, thus causing your browsing experiences to be less than satisfactory. If not, perhaps your Airport Extreme card is loose and the connection needs to be tightened - which is a simple thing to accomplish.