Is this article maybe working on the new operating systems?
How can i be sure of the speed of my connection if i reduce it to 1400 or 1300? If i go down with MTU the lower will be my connection?
MacBook, Mac OS X (10.7.4)
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If your broadband connections (such as PPPoE) adds extra packet headers, then your normal 1500 byte packets will be split slowing down your connection worse than not sending a few extra bytes per packet.
You could try using a utility that attempts to find the optimal MTU value.
<http://forums.macrumors.com/showthread.php?t=236942>
<http://www.bestyoucanget.com/optimizemtu.htm>
Or just Google "Mac OS X MTU optimize"