Speed up Accelerate Node Provisioning (Node pool, node template)

I would like to speed up the node provisioning. I guess the following steps could be used to speed things up:
Install docker into image e.g. ami
Where should I point the node template attribute for the engine install url then? Just an empty shellscript?

Pre-pull rancher docker images
I know the https://github.com/rancher/rancher/releases/download/v2.0.0/rancher-images.txt gives an overview of all rancher images but which should I prepull into my node images (e.g. aws ami)?

I am looking forward to your ideas