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BUG: Mountain Lion kills wifi speed when using airplay or time capsule

Hi,

Here is the situation, I have a MBP 3,1 Core 2 Duo 2,4Ghz.

I've upgraded from 10.7 to 10.8, and now, when I'm trying to use time machine on my time capsule (last gen), or airplay on my airport express (802.11n) the transmission speed drops from 160/200 to 6/13. (As you can see on the screenshots below. First image, without any of these two features / Second image, with time machine trying to find the time capsule drive / Third image, with airplay activate)

The time machine don't manage to find the time capsule drive and failed.

Airplay works for 3 seconds and stops. I've tryed airplay with itunes (the old way) and quicktime with the new airplay option, both stops after 3/4 seconds..

I made my 30Go time machine backup with an ethernet cable, it worked ok.

I still use my airport express with my iPhone without any problem.

And all other internet usages are working correctly, I can even acces to my data on the time capsule and copy files from with no problem, without this "transmission speed drop" situation.

I have 3 differents wifi signals in my (large) flat:

The time capsule broadcasts 2 different wi-fi n on 2,4ghz and 5ghz

and another Asus router broadcasts wi-fi b/g on 2.4ghz

I've tried the 3 different connections, all have the same "transmission speed drop" issue with airplay and time machine, and these two features don't work anymore.

And of course, I never had this situation with Lion..

Any solution, or is there definitely a bug with mountain lion handling my wi-fi card: AirPort Extreme (0x168C, 0x87)

I already reseted the PRAM and NVRAM; and did an onyx maintenance nothing changed...

Any help appreciate,

Thx

Posted on Jul 29, 2012 11:15 AM

152 replies

Jan 3, 2014 9:26 AM in response to alexander3k

The kext utility packaged with the kext earlier in this thread has an option for correcting the permissions.

Is there a reason why you're still using 10.8 rather than 10.9? Mavericks fixes the wifi issue, has better memory management, and runs a little faster than 10.8.

Jan 3, 2014 1:34 PM in response to Gunny Sack

Thanks. I did notice that. After a long night, everything is working beautifully after a couple of retries. Although sometimes, like right now, while streaming music to my AppleTV from iTunes, the signal clips in and out for a few seconds before returning to normal for a while. I have my wifi on 802.11 a/b/g/n because the signal, when I had it omitting the n-type, was transmitting at 6 instead of the 300 it should be when I'm sitting 2 feet from the Airport/Time Capsule.

To answer the obvious question - Mavericks is nice because it's free, but it's not nice that it kills my most frequently used design tool. I'm keeping 10.8 until I can save the $$$$ for the CAD software version that will run on 10.9.

BUG: Mountain Lion kills wifi speed when using airplay or time capsule