[em-bee]

when i spoke at an online conference in india i insisted that my talk be prerecorded to make sure there were no interruptions since i was worried that from china the quality might suffer some times. i sent the talk to the organizers to stream and after the talk we did a live q&a. i don't know if the participants felt a difference, but i thought it was the prudent thing to do.

[acidburnNSA]

That's very smart. You could even be in the q&a during the talk answering questions while pre-recorded-you is still speaking! This could give a lot more time for focused interaction.