<i>&gt; Our approach is to focus on functionality and correctness first, and then improve performance over time.</i><p>Just my two cents: I think that the interface and features are excellent and a joy to use, but performance was a show-stopper that forced me to quit using the Beta for Rails-application development:<p>- a simple request that took ~1&#x2F;3 of a second using VirtualBox and Docker Machine took six seconds on Docker for Mac
- a more complex request went from one second to twelve seconds<p>I didn&#x27;t have a chance to dig into it, but I would guess that it has something to do w&#x2F; osxfs and the many files that Rails loads, as it reminded me of the difference between using sharing files via VirtualBox&#x27;s own file sharing vs. NFS, the latter being a significant improvement.