Certain things are not possible. However, we try to match functionality as much as possible with localkube (and soon kubeadm).

Shared folders, especially using 9p and/or cross-platform have been an issue, and I personally also experience this in the fork Minishift, and this likely the performance issue you meant.

But back to an earlier question I posted, have you filed the issues you had in the issue tracker? https://github.com/kubernetes/minikube/issues

Yes, the docker/machine code is an issue. For this, the libmachine is mostly moved inrepo and we are working on abstracting and even replacing this.