I'm at my wits end here. My download/upload is usually maxes out at around 2.2 mbps, but ever since Mountain Lion it will stay at those speeds for a short time then drops. I'm talking about a top speed of around 75 kbps. I have tried 2 different routers (a Linksys and a Netgear), every tip I've found on the internet about this issue (renewing DHCP address, making a new location, reinstalling Mountain Lion) and none of it has fixed it. Can anyone shed some light here? I need this computer for school and it becomes unusable for most the day once this happens.