Why is video/audio jerky when computer played through Apple TV?

I have my MacBook Air connected to my TV through Apple TV and Airplay. When I am watching movies or TV shows from my computer through Apple TV, the sound and picture on my TV is often jerky, with sound going in and out and video freezing then starting up again. When I disconnect from Airplay, the movie plays perfectly on my TV screen. Why is the sound and picture so bad when playing through Apple TV? I use a brand new Airport Extreme as my router.
Thank you,
Ian

Dear Vazandrew, many thanks for your advice. The issue was non-existent with OS Maverciks and appeared after upgrading to Yosemite on iMac 2013. In addition to the stutter of image and audio on airplayed content in regular intervals, it is virtually impossible to disconnect the airplay from the Apple TV by selecting "disconnect airplay display" - one needs to restart the machine to disconnect. The configuration includes the latest release of Apple TV, with latest software, the latest Airport Extreme, with latest software, and the 2013 iMac with the latest OS - Yosemite. I would like to reiterate there was no stutter issue with Macericks and a google serach of the stutter issue shows this issue was reported by other users as well - following upgrade with the official Yosemite and a number of report during the beta testing of Yosemite.
I would be happy if someone could please advise how this issue could be escalated so that a proper attention is paid by Apple.

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Why is video/audio jerky when computer played through Apple TV?

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