Yes, does not apply to the present case.

This is not drop frames in layers window. This is how I see some times braking of video. Not with constant periodicity.

I also thought about it and conducted an experiment with 60 and 75 refresh rate of full screen and 25-30 frames movie. It does not affect.

50 herz no good frec for some led screen equipment.

I have 10.6.8 OS.

Ok. А good experience!

Thank you!

P.S. Need more layers, need additional widget for light console!