I have recently bought the new Retina MacBook Pro and I have been very disappointed by the wifi performance. First of all, there is the very well known and discussed wi-fi + bluetooth interference, which makes it impossible to use a Magic Mouse. Moreover, I am experiencing a terrible range on the wifi. Admittedly, my room is far from my wifi router, but my 2010 plain MacBook running Snow Leopard operates perfectly, while the signal on my rMBP running the latest Mountain Lion is close to nonexistant (something like signal strength of -8090dBm). Is this also a known issue? Is there any fix that I could try? I was thinking of even sharing my old MacBook internet connection with the rMBP over Bluetooth, but attempts have so far failed.