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There's still a bunch of devices out there that use b/g, like my Kindle (the one with the keyboard) and older iPod Touch's that haven't died yet. For that reason my wifi network still allows b/g/n devices to connect instead of n-only.

Um, surely if you are using a b/g/n router then you will have no issues with airplay as your faster Airplay devices will use n and your older non Airplay devices will use b or g. In fact if you think about what you have just said you will realise you have just confirmed you have already invested in the very upgrade the others have suggested.
 
I've been having issues. I haven't been able to figure out what was wrong until this article.

And I have the new AirPort Extreme.
 
There's still a bunch of devices out there that use b/g, like my Kindle (the one with the keyboard) and older iPod Touch's that haven't died yet. For that reason my wifi network still allows b/g/n devices to connect instead of n-only.

I'm confused though... This article is about wifi routers using B or G only. Having an N router that accepts B or G isn't an issue here. I have no problems with Airplay Mirroring from my wife's 2013 Macbook Pro on a Mixed network because it still connects via N.
 
Question:

Bought an Apple TV last month.

Rather dissappointed that most of the time SD videos don't play smoothly via AirPlay mirroring and HD 720p and 1080p always misses lots of frames (low framerate).
Both from a late 2012 hires 15" MacBook Pro with SSD and from the latest high-end late 2013 retina 15" MacBook Pro.

Is that normal on 802.11n wifi?
(Playing from QuickTime or VLC doesn't seem to make a serious difference).

Bluetooth is always off — is there anything I could do to improve things?

It could be that other devices on your network are using the bandwidth. I wonder if 'AirPlay' works for devices connected to the same network via ethernet. Because ethernet would be faster
 
I'm having trouble even streaming audio to my Apple TV (via my late 2013 15" rMBP). It has significant lag/choppy connection issues. I thought it might be an issue with the Apple TV, because I've also had issues with it losing audio after streaming Airplay via my iPad or iPhone.

Try downgrading the firmware of the Apple TV to 5.3. That solved my Airplay issues.
 
It could be that other devices on your network are using the bandwidth. I wonder if 'AirPlay' works for devices connected to the same network via ethernet. Because ethernet would be faster

On our Wi-Fi we can watch unique YouTube HD streams on four Macs simultainously without any hiccups, stuttering or compression errors.

Ethernet cables should work just fine — I just happen to love no-wires/wi-fi.
 
Are there any hiccups when you stream from the internet to the Apple tv? Maybe a bad reception/coverage issue where the Apple TV is located.
 
I have an early 2011 15" Macbook Pro and the Airplay mirroring ******** blows. Easily one of the worst things Apple has come up with, hard wired concoction all the way!! We need HDMI ports!!!!!!!!!!!!

...and we now have them...you have a 3-year old piece of hardware. And Airplay mirroring got a lot better after you bought your machine. Airplay is very useful. HDMI is useful as well. Have you tried getting a little Thunderbolt-to-HDMI adaptor for your TB port?
 
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