I've got a week 30 2GHz Macbook running OSX 10.4.8. Up until today, the networking performance on this machine has been exemplary on both the wireless and ethernet interfaces. But now, suddenly (after no changes to the Macbook), I get pathetic transfer rates to other hosts on my LAN - like 60-70KB/s. It doesn't matter if I'm using the wireless or ethernet interface, the throughput is the same. I've tested the other machines on the network, and they can all communicate with one another at normal multi-megabit speeds over the wire or via wireless. I've cold booted the Macbook, did a tcpdump to check for heavy traffic, and checked the CPU usage (nominal). There doesn't seem to be any reason why this should be happening. Has anyone else experienced this? The only other problem I have with this Macbook (and it's a big problem indeed) is random shutdowns. Any help or insight would be appreciated.