editing a large jpg making a selection with the flood select tool at 9% tolerance with the selection mode is set to ADD to make a few selections at 16% zoom, and as soon as I zoom in to near 350-500% to pixel work my selection fine details, the application goes 100% non-responsive within a few selection clicks. Oh I also use spacebar to grab and drag the image to move to a new area for fine selection details.
I have to force close the app. escentially manually crash my application. I can NOT use the app now, as I need to to make selections, that I need to make. I have done selections like this for many years and this is considered CORE functionality for a photo application.