I have migrated a small portion of my LR library to a new one for the 13" 2016 MBP (NT) with base config. It only has 14.5k photos. My full library (100k+) runs pretty well on my 2012 Mini quad core and 16g on a 240G SSD. However, even the little 14.5k library (which is running with smart previews on the main Mac SSD and has referenced / master files on an USB-C 3.1 SSD, clocked at 450 mbps), is running like a dog. Scrolling thumbnails is pretty choppy. I get a lot of spinning beach balls...even with just working with the smart previews. The full files make it worse. It's so painful, it feels worse than the 2012 Mini and feels like my old MBA 13" from 2012 (8G RAM and SSD of course). I had activity monitor running. Memory pressure never left the green zone, but it was about 50-65% up the graph. Never ran with less than 750MB showing free, but about 1.5G in cache. Swap used was 517MB. I also had the CPU history running on top of LR so I could keep an eye on that. It was consistently running about 75-95% just by looking at the graph, with peaks that maxed it out. QUESTIONS: Would the 2.9 GHz Touch Bar version with 16G RAM make a big difference here? I'm sure the 15" base model would run it better with the quad-core, but I'm liking the portability of the 13". How does LR run on the old 15"? I'm assuming the new one would be better than the old one. Any other suggestions? I am in my return window for another week. Photos runs VERY well on it (of course). No lag. no choppiness, etc. I just have a hard time trusting Photos/iCloud with my images and like the control of the DAM tools in LR (I really miss Aperture, that would be my ideal if it ever came back....won't happen though). Any advice appreciated.