O.k., I turn on the face chaser and record using Full-SHQ 1920*1080 30fps mode. I try playing it on computer and TV, still don't see any lag. Could you do a reset on the Camcorder and see if it make any difference?
O.k., this time I record a little bit longer about 1:24 and I just record myself with my face moving around with face chaser on and talking at the same time. This time, i do see some lags at about 50 seconds. So, I think you are right, it does have some issues with face chaser on at that mode.