Hi Guys, I've been trawling through the internet for days trying to find a solution to this. This is my set-up: * Mid 2011 21" imac, with 12GB ram. * ATV3 * Iphone 4 * Sky Fibre Optic 40mb Broadband (wirless N) My problem is that when i try and airplay mirror video from my imac, it stutters like crazy, for example streaming from itv player website, looks fine on my imac screen, but when i stream it to my TV via the apple TV it lags really badly. This has only recently been happening, it never used to happen? Also to further complicate things, streaming the same thing from my iphone 4 does not lag at all? Any ideas? new drivers for imac or something? im stuck?