Good luck with your demo. I suggest following the OpenEMR instructions to setup your own version of the software. Relying on a third party for an important work product that you don’t have a service contract with an SLA is always pretty dangerous if your job depends on it.
We intentionally slowed down the infrastructure for people hammering our demo sites with automated testing as we’ve been dealing with that a lot lately. Wouldn’t be a problem if people were donating significant funds for us to scale out the infrastructure… or if a group wanted a dedicated testing environment and donated to the foundation to provision that…
Again good luck.