Video AirPlay From Yosemite iMac Lag

When I AirPlay a full screen video to the Apple TV there is a small amount of lag / gitter.
I currently have the 3rd Generation Apple TV, updated.
I am also using AirPlay on an iMac with Retina 5K display, OS X Yosemite (10.10.2)
I use an E4200 Cisco router with the latest firmware.
iStrumbler result:
S/N 71 db, Signal -24 dBm, Noise -95 dBm, Channel 157 (I'm only one using this channel in the area), Frequency 5785 MHz.
I have verified both Apple TV and iMac connected directly to my router with same results.
I have been using VLC as my video player.
The only thing that has worked for me was using Beamer  http://beamer-app.com
If I use Beamer there is no lag or bitter, perfect video!
I have posted about this similar issue in the Apple TV community and was suggested trying another router, so this morning I purchased the Apple AirPort Express and experienced the same lag/gitter results.
Any help or suggestions would be appreciated, I rather not purchase additional software (beamer), to resolve this issue.

Thanks @vazandrew for quick response!
I set the Apple TV and iMac both connected directly to my router with the same results.
I have also used istumbler and Apple's Wireless Diagnostics provided with OS X.  My signal strength and noise are all strong and normal.
I also moved my wireless router to a new location just to be sure.
I'm using VLC to play the video, maybe there is another better player?  The video is running perfectly on the iMac just gitters on Apple TV display, it almost becomes unnoticeable after watching for a bit.

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