Ok, I don't understand this at all. We got our new fast 10mb NTL cable internet line installed a few days ago. I was trying to get it set up with my iBook but kept getting speeds substantially below what we should get. I was getting line speeds of about 1.5 to 2.5 MBbps. I figured there was something wrong with the line so I called up NTL and hassled them. The lady on the other end of the phone (who was a tad useless) insisted that I had peer-to-peer applications running which were slowing down the line. I repeatedly told her that I did not have any running and that there weren't any even installed. She said she'd send out an engineer but if there wasn't a fault with the line I would get charged for the callout. Now yesterday I received my MacPro. Late last night I thought I'd test the speed again. In Windows I get 5 - 9.5 MBps, which is what you would expect from a 10 meg line. Restart into OS X (fresh install remember) and I get 1.5 to 2.5 MBps. I then decided to connect the NTL modem through a router instead of straight to the machine. Same results. Windows is fast, OS X is slow. Why on Earth should OS X be so much slower at surfing the Internet than Windows?? It doesn't make sense!! Edit: I am using a wired connection btw, no Wireless.