On some cameras, live playback may stutter, or there may be a time significant delay between actual actions and the action shown on Live view. For a better viewing experience it may be helpful to adjust the live buffer size from the default of 600ms.
To do so, open Main Menu, choose Local Settings > Advanced, then adjust the Maximum Live Buffer Length to the smallest possible value that does not cause issues with live view on all cameras.
•Larger buffer makes playback smoother but increases the delay between real time and the live display
•Smaller buffer decreases the delay but can cause stutters on playback
See also "Double Buffering" and "Disabling Blur for Intel HD Graphics".