Using a Wacom Intous pro S
When pressing the Alt button to use the eye dropper and brushing in no time PS pauses for 10-20 seconds becoming completely unresponsive. I've tried turning up and down the Cache, turning off the graphics processor, using more RAM, adjusting the Cache levels and size, all without effect. At this point it pauses so often it is unusable for painting.
It only happened when using my Wacom and pressing Alt at the same time. I solved it by unchecking Use Windows Ink in the Wacom control panel. I believe what was happening was that the Alt key was being "pressed down" non-stop as I held Alt to grab a new color with my pen.
Message was edited by: Novus Caelum Edited for solution