Q: When using airplay from mac to apple tv it lags/freezes, but works fine with iPhone

had the same problem after updating my mac

the way i fixed it was: quit the wireless connection and delete is from mac then reconnect that was it now it works fine but had to try many other things before that !!!

anyways apple should be able to fix that issue since we pay them a lot money !!!

The problem is not with you AppleTV or your Mac. Your problem is the network. I had the same problem and finally solved it.

airplay makes screen mirroring, there is a lot more data to be sent from you mac than from your iPhone or iPad

-> airplay can be okay from the small monitor, but jumpy/lag from your mac->Network handles the smaller data sufficiently enough.

"five bars on my wifi" does not mean you get great signal strength.

-->press "alt"-key on your keyboard and then click on the WiFi symbol on your mac to get more data.

You want to look at "RSSI" and "Noise".

- RSSI (=received signal strength indication) can go from 0 to -100 (on apple). Closer to 0 is better, closer to -100 is worse. My RSSI is -54dBm meaning that the signal strength is 54dBm less powerful when it reaches my mac than when it left the base station. For WiFi normal range is from -45 to -87. Below -85 is more or less unusable (for example -90 is just horrible).

- Noise is a combination of all unwanted interfering signal sources (your wifi is not the only one in the neighbourhood, radio frequencies interference etc). this is valued form 0 to -120dBm. Closer to -120 is better(little to no ninterference), closer to 0 is worse. My Noise is -94dBm.

Calculate your SNR margin by doing the following:

SNR margin = RSSI(dBm) - Noise(dBm)

for example my RSSI is -54dBm and my Noise is -94dBm and thus

my SNR margin = -54dBm - (-94dBm)= +40  --> the higher the better.

SNR over 40 excellent, 25 to 40 good, 15 to 25 airplay probably will lag, under 15 is just horrible.

What can you do to get better SNR margin which means of course no lag/jumpy video on airplay form you mac to AppleTV.

1. You can use a router that has 5Ghz instead of "the normal 2.4GHz"

-5GHz is faster with a good signal, but 2,4GHz will go through walls better. A couple of walls(even thin walls) will kill 5GHz quickly, distance also kills it more quicker than a 2,4GHz. Most people use 2.4 GHz and the channels on 2.4GHz are more crowded.

2. You can use ethernet cables to connect either your mac or your apple tv to you router. Beware there are different ethernet cables though, I tried an old ethernet cable which i got in 2000, but boy did my internet connection (internet speed test) get worse readings than through WiFi.

3. You can buy a powerline adapters (sends your network to your power line)

What did I do?

a) My router is upstairs (I get internet from 4g antenna mounted on my outer wall). ->Airplay really bad (new AppleTV 3rd gen, new 27' iMac).

b) I bought a router that handles 2.4gHz and 5Ghz (TP-Link Archer C7, cheap & got lots of awards), connected it with a new ethernetcable to my upstairs router. Connected appleTV and iMac to the new router on the 5Ghz bandwidth. -> Airplay got better but still bad.

c) put my MacBook Pro into use, pressed "alt" key and then pressed the WiFI symbol on the top right corner, looked at my RSSI and Noise and noticed that next to my apple TV my SNR margin was a lot better than next to my iMac, so the problem was the WiFi connection between my iMac to router rather than between my router and appleTV.

d) Used a longer ethernet cable so that my Archer was upstairs above the room my iMac is in-> SNR margin got better-> airplay got better ->still not watchable enough.

e) bought power line adapters (didn't know they existed, didn't believe they were good, my brother recommended them, the shop offered a 30 days trial & return policy) (Netgear powerline AV500 (XAVB5401)). Now I get internet through 4g to my original upstairs router. Upstairs router to Netgear powerline via ethernetcable. Downstairs  the internet comes from my power outlet via the second Netgear powerline through ethernet cable to my Archer C7 router. iMac and appleTv are connected to Archer-router via 5Ghz WiFi.  ->Airplay works wonderfully with VLC,iDVD,Quicktime,iTunes, from a movie DVD connected to my iMac.

One could of course just use router to powerline via ethernet cable and then powerline to mac and another poweline to appleTv that would have been the neater solution.

You can also look what channels your neighbors use (press "alt"-key + click on WiFI symbol). there are some charts in the net that show what channels interfere , what channel should you put your router on.

An easy test should be to put your router, computer and Apple TV next to each others and try airplay (hey your router doesn't have to be connected to the internet to be able to do this), if that solves the lag, then your network is definately the problem (SNR margin remember?).

Hope this helped, i cursed that I didn't find an explanation like this, people just say "bad apple", "why doesn't apple fix this", "I have 5 bars on my Wifi so the network can not be my problem" "solved it by lowering my resolution (=less data to be send so they had almost enough of SNR margin, enough for low resolution(less data),  not enough for higher resolution or something like that)! !

Click "this helped me" if this really helped, you so more people find this lengthy text easier ! !

I tried everything, don't really understand the router settings as mine is a BT Hub and doesn't seem to have any settings as described. Just bought beamer for £12 and eventually I can do what I thought I would be able to with my mac and apple TV! Thanks for this post.

Thanks! This helped me instantly.

I have been searching for a solution for this for months now - I was close to buying a new router (I have Asus RT 66NU). I can reproduce it every time: awdl0 up -> stutter; awdl0 down =>smooth airplay mirroring. It is still router- dependent somehow. A friend of mine has a different router (AVM FritzBox), and it worked smoothly with my macbook pro retina from the start (without the above solution). Maybe the router filters out some packets that are responsible for the lagging.

Shame on Apple.

Best Regards,

Markus

Turning off VMware seemed to do the same for me.

Andrew

Try convert your video file to mp4 and stream it through itune

i had the same issue, found this solution in a chat. it works perfectly for me.

hi The problem have been sorted for me i tried ol the option and this one worked for me 1.Go to settings menu on atv 2.scroll down to Audio video 3.scroll down to Tv resolution and change it from auto to ur tv mine one was selected to 1080HD-60 Hz works perfectly fine for me with no lag 2013 macbook pro 15 retina with yosemite hope this solves for you

I had the same problem and solved it by turning off bluetooth and all bit torrent applications. Turning off bluetooth is the most important part since I am using the wireless keyboard and trackpad, it consumes a lot of traffic.

Credit for this tutorial on YouTube: https://www.youtube.com/watch?v=rH5FDtV87GA

The Problem is simple,

Go to your Apple Tv

Setting

General

Bluetooth

Turn it Off

then start airplay and it will work perfectly no lag or freezing.

The Problem is simple,

Go to your Apple Tv

Setting

General

Bluetooth

Turn it Off

then start airplay and it will work perfectly no lag or freezing.

Had the same issue. This did the trick for me.

Definitely did NOT do the trick for me.  Bluetooth off didn't help me in any way

I always used my macbook pro retina nov 2014 with airplay to mirror my screen on the apple tv. Since the update to yosemite, this is no longer possible.  The lag is terrible.

I used my iMac for Airplay as well, until two weeks ago: I updated to Yosemite, and guess what: 4-5 sec. lag.  This is clearly an Yosemite problem.

When to the apple store, called apple: "we are not aware of such issue".

guys I was able to fix my problem by replacing my router with a different brand. No more lag and no more disconnects.

My router is an Apple AirPort express

Wow, I too am having the same problem.  I can stream with my iPhone 5s but not with my Macbook Pro retina display. I notice the original post is from 2013 and here we are in 2015 and still not fixed. 

I seem to have better results using VLC for vids when using airplay. The usual lags I get when playing videos using quicktime are virtually gone. I was experiencing the lag problems with my Macbook Air (2013)