I'm making an HDR pano with AP's in-built fusion option. I'm finding that when I use the sliders (e.g. for dark enhancement) that the preview takes a long time to update, so long in fact that by the time the preview is updated, I can't remember what it looked like before (so I have to save before- and after- screenshots).

Is there a way of making the update faster? A better graphics card?

Could there be an option to make previews based on a coarse sampling of the image data?