Mirroring from mac(osx 10.8.2) extremely slow

Hi there,
Im having problems using Airplay from Mac. I have OSX 10.8.2
Apple tv latest gen updated to the latest firmware.
When i trying to activate Airplay on my macbook air (1.7 Ghz, core i5) it takes ages to stream it to the tv.
Airplay shows that is active on the mac screen, but apple tv remains blank... then 5 min after i can see a fix frame ... etc...
Simultaneously if i go to my Ipad (3rd gen), streaming videos and youtube works flawlesly, but if i try to mirror a game or try to play a song it get extremely slow....
Any thoughts?
My router is a Linksys E3200 and im using a 5ghz wireless network.
thanks!

hi everybody
I really need some help so here is a little up !
thanks !

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