There have been a few threads lately about slow Macbook internet out of the box, with the Mac getting download speeds much slower than the PCs on the same network. I was finally able to fix this issue with my Macbook. I have a new SR Macbook with Leopard preinstalled. Out of the box, the internet was about 1/4 as fast as my PCs, with both wireless and directly connected to the modem. Some people have reported changing the DNS servers to the openDNS.com servers under TCP/IP and the router solved the problem for them. It solved it partially for me, but internet was still quite slow. I finally came across http://miranda.ctd.anl.gov:7123/ This can diagnose where the problem is on your network. For me, it said there was a duplex mismatch (host full switch, client half switch). It only said this on 3 of the 5 times I ran the test, since I believe it's an intermittent issue. So I went to system preferences -> network -> ethernet -> advanced -> ethernet .. and changed the "automatic" setting to the following: Configure: Manually Speed: 100baseTx Duplex: full duplex MTU: Standard (1500) This worked for me, and the wireless and direct-to-modem internet is screaming. I am using an Airport Extreme Base Station with Comcast cable modem. Hope this helps.