Used to have internet sharing working fine (full 10mbps DL speed) on SL and Lion 10.7.3, then i clean installed ML (updated to 10.8.1). Problem is connected devices DL/UL speed can't reach above 2mbps (200 kbs) when my host connection works at 10mbps. Sharing used to work at full speed. I've tried renaming network id, no encryption, different channels, etc. This is on Macbook Pro 13 early 2011. Can anyone test the internet sharing in system preferences. Connect a device then speed test it. See if it gets your full speed or is capped at 2mbps? Can't believe apple is having so many problems with internet sharing in the last few updates.