Macbook Pro Retina issues with Wifi Speeds

I have one of the new Macbook Pro 15" Retina models and have been having issues with Wifi Speeds.  Apple has replaced the computer but have the same issue with the new one.  When doing a side-by-side comparison with older Macbook Pros and PC's I'm seeing around a 10 megabytes per second difference.  Is anyone else experiencing the same issue?

So an update on what I've found.  After testing two different MBP Retna's basically hourly for 4 weeks I found a few interesting things, but ultimately resolved my issue.  The first thing I found consistently between both MBP Retina's both on my network and in the Apple store on their network was the first thunderbolt port closes to the screen is slower than if you try to use the LAN cable adapter on the second port. I saw about 10 GBps between the two ports.  The second thing i found was these new MBP Retina's aren't really compatible with older Apple networking technology. I have a single band Airport Express and a single band Time Capsule.  Using either router they only worked on the 2.4 5Ghz setting and even with that the speeds constantly fluxuated. Most times I got between 2 - 10 GBps.  After hours of troubleshooting it was recommended to update either my Time Capsule or Airport Express to one of the newer dual bands, which I did.  After purchasing and setting up a new dual band Airport Express and spliting the networks to have one band constantly on the 2.4 5Ghz setting and the other set to automatic both with differing network id's this solved my problem.  I now consistently see download speeds of around 35GBps and upload around 6GBps.  So connecting the dots and drawing logical conclusion, these new MBP Retinas are really only compatible with newer dual band Time Capsules or Airports.  Even though my single band was also set to 2.4 5Ghz, the same as the dedicated network used now on my dual band Airport Express, this MBP Retina had issues maintaining WiFi speeds.

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