Sorry to be a pest but reading my last comment I wasn't very clear. The latency is on the TV but also on my iphone as the app runs. Once I revert back to normal play (without mirror), the app on the phone displays as normal. Didn't know if that was something within the app that could be tweaked. I will try working with the offset but that is tedious if I am using airplay for practice and a different setup to play "live". I would have to keep changing the offset back and forth. Or live with the lag for practice application! I will keep experimenting with your suggestions, including hdmi. Thanks!