I've upgraded Lr classic 7, and was looking forward to enjoying the new features. To my great disappointment Lr started working so slowly that I can hardly process my photos in it. It annoys a lot just to list presets, to say nothing to work in develop mode. How can I fix this problem? Can I upgrade it one more time? I'm not happy with reinstalling Lr because I don't want to lose my albums, which I had once in my practice..