Scale free remote Docker builder

Is there a way to speed up building and deploying my docker image (I have my own Dockerfile defined)? I don’t wish to do any local docker builds.

The free remote builder has 256MB memory and 1 CPU core. My average docker image is 200MB in size. The fly deploy command, when nothing in my image requires updating, still takes over 20 seconds to complete. Is there a way to scale the free builder to add more memory and/or CPU?

Edit: I was able to bump up the memory and CPUs to the max allowed via a fly machine update command. However, when deploying the same exact image (around 200MB), the deploy takes over 70 seconds even the second time around. I know the Fly builders are supposed to be caching image layers; since none of the layers have changed, shouldn’t the second deployment be super fast?