Well it's got me stumped too. Since you already checked your connection speed as you hinted earlier from that link in the other thread. It must be fine right.

Only other things I can think of are installing the 4.2.4 version of LW. And doing a complete system check. I mean a SAFE start & repairing permissions & repairing the HDD using Disk Utility.

By the way, to check how much ram all your processes are using open up Activity Monitor found in your Utilities folder.

Oh I don't suppose you use a USB modem. Some have optional USB/Ethernet mode for connection.

Perhaps you should ask Stief on the forum.