Quicktip #28 (February 28, 2009) Turning off realtime video scopes for better playback
The realtime updating of the video scopes that was added to Final Cut Pro a few versions back is very handy:
But on occasion I’ve noticed that having the realtime scopes might affect playback quality and frame rate in the Canvas. It doesn’t seem to happen often but if it does then the realtime playback can be turned off in the pop-up menu in the timeline:
Some people just find the realtime playback annoying so that might be another reason to turn the realtime playback off as well.