Recently, I have noticed that after upgrading to Yosemite OSX there is significant lag when I use Airplay to my Apple TV. When I was on Mavericks OSX there was never an issue of lag. The same thing happened with my wife's macbook pro. After I upgraded to Yosemite hers still had Mavericks and I did confirm using Airplay did not have lag on her macbook. However, after she upgraded to Yosemite her macbook experienced the Airplay lag as well.
Here is what I have tried:
I've restarted both the macbook pro and Apple TV and connect to Airplay, but there is no improvement.
I have replaced the HDMI cable that connects from the Apple TV to my TV.
My Apple TV is connected to my Airport Extreme via ethernet cable. (Always has been.)
I have turned off the wireless on my macbook and connected an ethernet cable from the macbook to the airport extreme. (There was slight improvement but still noticeable lag; it was tolerable I guess.)
The Apple TV has not had degraded performance at any other time.
Macbook Pro (15-inch, Mid 2012)
2.3GHz Intel Core i7
16GB 1600 MHz DDR3
Intel HD Graphics 400 1024 MB / NVIDIA GeForce GT 650M
The fact that I have 3 Apple devices and am still experiencing this is super annoying.
What are my options?