Wifi downstream issues with MBA (4 hours troubleshooting)

Discussion in 'MacBook Air' started by crimson090, Aug 3, 2012.

  1. crimson090 macrumors newbie

    Apr 6, 2010
    Problem: Getting < 10 Mbps downstream via Speedtest.net with Bluetooth enabled, < 15 Mbps with Bluetooth disabled. Upstream is actually faster consistently, a bit over 10 Mbps.

    It's very inconsistent. In the past few hours I've testing I topped 20 Mbps, once. Then just the past few minutes I got 1.5 Mbps (with Bluetooth disabled).

    Causes Eliminated:
    • ISP. PC connected via ethernet gets 70 Mbps
    • Router. Replaced a Buffalo router running DD-WRT with a Asus router running Tomato.
    • Wifi: iPhone on the same network gets over 20 Mbps (if it's in range of a MBA with Bluetooth on however, that speed is greatly reduced)
    • Computer: My wife has a Macbook Air that has the exact same issue
    • Outdated OS: We're both on Mountain Lion but had this issue on Lion as well
    • General Wifi issues: My link speed in the menu shows 72 and the Network Utility link speed shows 144 Mbit/s

    Fixes Attempted:
    • As mentioned above, disabling Bluetooth increases the speed by ~5 Mbps. Unfortunately this makes all of our Bluetooth keyboards and mice useless. However if I was able to disable Bluetooth and get > 15 Mbps I'd be at least a bit happier
    • Went to Network -> Set Service Order and put Wi-Fi above Bluetooth. This actually increased speeds from 1 Mbps (lol) to 10.
    • Plugged in manual Google DNS
    • Replaced wireless router (mentioned above)
    • Changed wireless channel several times
    • Forced N only mode
    • Disabled wireless security
    • Moved around to different locations including right next to the router
  2. stockscalper macrumors 6502a


    Aug 1, 2003
    Area 51
    Wish I could help you. I've had the same problem ever since I got my MBA and after trying everything I could research and getting the internet provider involved, I finally gave up.
  3. fanta macrumors regular

    Jun 2, 2011
    since BT and Wifi share the same frequency (2,4ghz) in some cases the solution might just be to switch wifi to 5ghz with another router. been having the same problems and ended up getting an airport extreme. MBA uses 5ghz and has no intereferences with BT...

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