If I understand correctly, Docker's performance on OS X is a function of running in a Linux virtual machine, because Docker requires Linux. Is there something about Docker that you feel like inhibits performance beyond the VM itself?
tldr: boot2docker should expose ways to leverage faster vm configurations.
The advantage of doing it in Docker proper is that it works in all distros without outside dependencies, instead of just boot2docker.
Note: we are looking for help on this, if you feel willing and able. Even better if you can invest some recurring time to maintain and help others contribute.