Can't really offer any help, just a ??
Is this speed reduction when you are using the wireless function, or ethernet (wired) to connect to the web?
If wireless, are you close to the reciever, or are there obsticles such as walls or electrical things (like microwave ovens) between the pc/lt you are using to connect and the router?
Walls (and sometimes microwaves, though I would have thought this would only apply when they are operating), and distance can have dramatic affects on the connection speed.