In summary BRL, your wireless speed is far, far faster than your ADSL link. You can see a good example of this if you try to wirelessly transfer a file from one PC to another - a 100MB file which might take anything between 10 and 30 minutes (depending on your broadband connection speed) to download from the internet will take just seconds to move from PC1 to PC2 (or vice versa).
Hope this helps.