In reply to Kevin McKernan.

The native docker app uses HyperKit / xhyve. The developers of Local suggest that they benchmarked the two against each other and VirtualBox CPU performance was 2x.

https://local.getflywheel.com/community/t/native-docker-for-macos/99
https://docs.docker.com/docker-for-mac/docker-toolbox/
https://github.com/docker/HyperKit/

I love Local, performance is outstanding, but will be keeping an eye on this.