Actually just since I update Ps to 21.1.1, there is a lag, screen black out when you do any adjustment sliders. For example, Hue/Saturation - Move one of the sliders and the screen blanks out so you cannot see or compare the transitions between the two adjustments (pre-adjustment and post-adjustment). You basically have to try and visulize what it was like before and then wait for the new adjustment to pop back on the screen. In other words you cannot see your attempted adjustments in real time because I don't have an image on the screen when I move a slider. This is absolutely a new glitch!