I was frustrated and perhaps did not explain the situation clearly. Once I get into Lightroom everything works fine; my imports and exports are fast and trouble free and running the Topaz plug-in works without issue. My problem, which has been going on intermittently for over a year now, is that trying to get into Lightroom is either very slow or, just as often, the programs locks completely. I do use a SSD for my boot drive, though my files are stored on a n external 7200 rpm HDD with a full backup to a second internal 7200 HDD. When I posted the above I had tried five times to get into the program and had it lock up. I've now uninstalled the creative cloud app and its programs and reinstalled and updated everything, and since then have been able to get into Lightroom, but I've used this fix before and the problem has eventually come back. Once I was in the program I did indeed optimize the catalog, but I could not do that from outside. I have 65,000 images in my catalog, which needs a good weeding out, so I don't worry so much if the startup is slow, but being repeatedly locked out of the program altogether makes me want to start pulling my hair out. I've set the Creative Cloud desktop app to now update everything automatically in the hopes that solves the problem. If not, I'll be sure to report back. I repeat: Once I'm in the the program, my workflow, a habit of many years, runs smoothly. I really don't want to give up on Lightroom, as I have used it for years and developed a workflow which, while not the most efficient, works well for me. Thanks for the comments from all.