Lightroom CC smart preview upload first.
currently when you import in lr cc on the desktop you need to wait for all of the original files to upload to cloud before culling and adjustments. there is a option in the mobile apps on iPhone and iPad to only download smart preview ... it would be super amazing to be able to have lr cc create the previews first.... upload them for work to begin while the original files upload to the cloud. currently I use a 50mp camera and my raw files are 119mb each. 416 photos from my trip was 60+ gigs of data. its taking some time to say the least and I have a fast internet. I can't work on these mobile until they finish and that's not ideal.