Hi, I had this annoying problem, when some Bluetooth device was connected to my Surface Pro 2, the Wi-Fi speeds would drop significantly to the point of becoming unusable. This was bearable with my mouse connected, but when the Bose SoundLink Mini was playing music from the tablet, I could barely run a YouTube video at the same time ! I have to say that after I installed Windows 8.1 Update 1, this problem is gone. I have tested it multiple times, now the Wi-Fi speed is unaffected by my Bluetooth speaker and mouse being actively used at the same time. I have download speeds of a few megabytes, when I couldn't get over 20-50 kilobytes before. And I am only using the 2.4GHz band, the one affected by the problem. I was on the verge of spending around $200 for a dual-band router + new DOCSIS 3.0 cable modem, but for now I saved the money. I would like to hear others opinions (who installed the update) on this too. Was the problem fixed on your end ?