Hi. My Imac is pre 2011 (or 2010) not exactly sure and doesn't have the 'Airplay' facility built in. I've purchased 'Airparrot' but the lag is ridiculous. I can see my imacs mirrored screen on my Television no problem but when i try and do anything, even something as little as move the mouse the delay on the t.v is anything up to a minute. Any suggestions?