MacBook Air :: 2012 11" Slow On 5Ghz Airport Extreme Wifi Network?

Jun 29, 2012

I'm encountering an issue with a new Macbook Air and would grateful for any insights. I have an Airport Extreme (latest model, 5th gen, A1408) based network (all updates applied). I have a new 2012 MacBook Air (11") that I noticed was suffering from VERY slow wifi speeds. After looking into it, I realized that if I used the configuration utility to separately name the 5GHz network and connect to wifi on the 2.4 Ghz network, the speed radically improved. 

To illustrate, using speedtest.net, I saw download speeds of 35-38 Mb/s using the 2.4 Ghz network. This drops to 2-3 Mb/s when using the 5 Ghz network. The Macbook Air is showing an RSSI value of -56 when connected via 5 GHz and -51 when connected via 2.4 Ghz. 

Other deivces in the home have normal connection speeds on the 5 GHz network, as does a previous generation, 2011 MacBook Air.A friend's also new, 2012  11" MacBook Air exhibits the same symptoms, so the issue is not specific to my unit. 

Info:
MacBook Air, Mac OS X (10.7.4)

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Is there a known issue with the wifi that I've missed? 

I did some further testing to try and identify the cause of the wifi problem. I installed Windows 7 in Parallels and transferred the exact the same files once again. Here's where it becomes interesting. Transferring those same files on my Macbook, using Windows 7 under Parallels, the speed was the same as it was on my physical Windows 7 machine, i.e. a constant speed of around 6MB/s. I then switched back to Mac OSX again and the speed once again decreased to around 1MB/s.

Info:
MacBook Air, Mac OS X (10.7.4)

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Jul 4, 2012

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Info:
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The Airport Express is connected to the Airport Extreme in bridged mode.

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Jul 22, 2009

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I have a slow network issue. I'll try to make it as simple as possible.

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Info:
MacBook Air, Mac OS X (10.7.3)

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setting mbp: 2.4 GHz / 802.11n
setting imac: 2.4 GHz / 802.11n
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setting mbp: 5.0 GHz / 802.11n
setting imac: 5.0 GHz / 802.11n
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Info:
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