Problems mirroring mac pro on TV with apple TV3

I just got an Apple TV3.  It works with the typical Apple TV stuff, except Mirroring. I'm running Mavericks on a Mac Pro (2012) and there is 1 minute or so delay between what I seen on my Mac on what the TV displays.  I follow the exact steps people show on Youtube with the same bad results. Any suggestions before I exchange this unit? Thanks

I just solved the problem!  There were two issues: (1) The power cord to the DSL modem was broken ... it was turning the modem ON/OFF randomly-- I replaced it, but the Apple TV still didn't work well.  (2) The router (Linksys E2500)  I replaced the OEM firmware for the appropriate Tomato firmware version, and after completing its setup ... Voila! the Apple TV worked as expected ... it's a beauty!

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    @ Hatter
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