Currently Being ModeratedAug 1, 2012 10:24 AM (in response to sirhyll)
I tried streaming a video over Plex and the tx rate stayed pinned at 300. So, as you pointed out, it seems limited to Time Machine and Airplay. I wonder what's different about them. Do they use encryption?
Currently Being ModeratedAug 1, 2012 10:41 AM (in response to sirhyll)
One more test. I used my ATV2 to pull audio from my MBPro instead of pushing audio from my MBPro to my ATV2. No problems.
Currently Being ModeratedAug 1, 2012 1:31 PM (in response to Gunny Sack)
Yep, I hope they'll fix this on 10.8.1...
Currently Being ModeratedAug 1, 2012 1:45 PM (in response to sirhyll)
Same problem here. Airplay dies after streaming 2 mins. of music (or less).
PRAM reset doesn't work. SAC reset doesn't work. MTU manual set to 1200 doesn't work.
Currently Being ModeratedAug 1, 2012 2:22 PM (in response to santranyc)
Feedback form submitted, with extensive detail. I referenced this thread, and also gave Apple a complete rundown of my experience with the problem and the troubleshooting I've done.
It does seem to only affect older (2007?) airport cards in Apple computers. My October 2010 MacBook Air has no problems whatsoever with Airplay or browser latency. I upgraded both machines to Mountain Lion during the last five days.
Maybe we'll get lucky and this will get fixed in 10.8.1 or .2.
Message was edited by: santranyc (typo correction and addition of one word)
Currently Being ModeratedAug 2, 2012 1:03 PM (in response to sirhyll)
I have the same problem on my MacBookPro3,1. WiFi Speed goes from 243 to 13 or 6 as soon as I use airplay to my Apple TV or a Time Machine backup starts.
Currently Being ModeratedAug 3, 2012 10:24 AM (in response to Gordon Buchanan)
Please fill up a bug report form at
Hope they'll work on it soon...
Currently Being ModeratedAug 3, 2012 6:58 PM (in response to sirhyll)
Bug report submitted. Exact same problem on my MBP 3,1.
Currently Being ModeratedAug 3, 2012 9:53 PM (in response to sirhyll)
Mine is doing the exact same thing. I have a 2008 MacBookPro 3.1. It behaves the same way during a time machine back up over wifi. It doesn't really appear to affect my internet connection, but it does completely suck on the back up. I have to leave it open over night to back up the Mac. I haven't had a chance to test the Airplay yet as I don't use it much from my Mac. I did mess with Air Parrot since mine won't support mirroring without this add on. It behaved poorly and I think that this is why. I will test that too. My Wifi has gone down to a transmit rate of 6. Ah well, the bleeding edge is the cutting edge and WE BE BLEEDIN Boys!
Currently Being ModeratedAug 4, 2012 6:56 AM (in response to MacMunfordGB)
We'll it seems to behave differently on the 2.4 GHz connection to the 5 GHZ one. My transmit rate bounces around from 39 to 19 to 13 .. well maybe not ..
Currently Being ModeratedAug 4, 2012 7:05 AM (in response to MacMunfordGB)
It does seem to be backing up a little better and I do mean little on the 2.4GHz
Currently Being ModeratedAug 4, 2012 2:40 PM (in response to sirhyll)
I am also having the same issue on my 2007 Macbook Pro. FWIW, I've found that turning the wifi off, the immediately back on will fix the issue, but only for that backup.
Currently Being ModeratedAug 5, 2012 2:32 AM (in response to sirhyll)
I'm seeing the exact same thing with my mid-2007 Macbook Pro: Time Machine over Wifi is killing my wifi speed - on a 5GHz network the transmit rate is reduced to 6 and MCS index reduced to 0 during the TM backup. As soon as the TM backup finishes, then the Wifi signal goes back to 270+.
I'm really hanging out for 10.8.1!
Currently Being ModeratedAug 8, 2012 9:00 PM (in response to sirhyll)
i'm having the same issue with my 2-year old iMac. didn't notice the connection to time capsule but will pay more attention now to see if it only happens then (i often find myself canceling backups because it causes such a slowdown on my system anyway). Seems like i only get a few mins of wifi then it dies, but turning off/on wifi seems to help for another few mins.
Currently Being ModeratedAug 13, 2012 1:20 AM (in response to superrrabbit)
Please report the bug to apple