I have upgraded from Lightroom 5 to Lightroom CC. Is there no way to build 1:1 previews that stay at 1:1? I like 1:1 previews to compare sharpness one image to another but can't do that now because every time I switch to another image I have to wait for the preview to rebuild 1:1. Its an incredible waste of time and virtually impossible to compare one image to another at 1:1. Is there some other way to deal with this that I don't know about? In LR 5 I would import at with standard previews, edit down and build the important photos at 1:1. I have found no way to do that now or even import at 1:1.