I'm new to apple products, and especially new to Apple TV. I have tried connecting macbookpro to Apple TV using Airplay and was successful, however, I find that when it was shown on the projector screen, it was rather laggy. What was on my mbp screen was not reflected on my projector screen simultaneously.

The next issue i find is that when I try to do MS Powerpoint slide presentation on my MBP. it worked perfectly, however, when I tried to show it on my projector screen, the powerpoint presentation mode got kick out.

I don't have this issue with my other MBP. I have checked that the wifi is the same configured for Apple TV and my MBP.

Thank you.