https://blogs.adobe.com/lightroomjournal/2017/07/on-lightroom-performance.html On Lightroom Performance I would like to address concerns recently voiced by our community of customers around Lightroom performance, as improving performance is our current top priority. We have a history, starting with our first public beta, of working with our customers to address workflow and feature needs, and we’d like to take that same approach regarding your performance concerns. We already understand many of the current pain points around GPU, import performance, certain editing tasks and review workflows and are investing heavily in improving those areas. Over the past year we’ve added numerous enhancements to address your performance concerns but we understand we will have a lot of work to do to meet your expectations. If you have feedback or would like to work with the Lightroom team on your most pressing issues, please fill out this survey. So if you tired of the miserably slow Lr performance rendering previews, exporting....etc., now is the time to let them know what you think!