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But the best thing about docker is that it's not a VM. It's a containerization layer built on some linux kernel (only) features. It's not fair to compare it to a VM, or even to put it in the same class of programs.

To repeat the test with Docker you'd need to use VirtualBox anyway.

(Docker is Linux only. To run a Docker container on OSX, you need a Linux VM.)

But you will only need 1 VM :) For realistic testing of a multi-component stack, performance gains start adding up very quickly. There's also the start/teardown time if you want to run tests from a clean environment repeatedly.

In short: the right way to use VMs is as dumb chunks of hardware. Using them as logical units of software makes increasingly less sense as container-native tools get better.

(disclaimer: I'm the Docker guy :)

Docker isn't really a VM...it's more of a virtual application platform.