X forwarding might not be the best comparison since it can perform worse than VNC and certainly worse than a better RDP implementation in most situations (if the person you are discribing it to is actually familiar with it). Hopefully it is a bit smarter along the lines of XCB an NX protocol or at least allows the potential for it.
X forwarding is powerful/convenient but bad as is.
Basically the thing to avoid is lots of back and forth between the server and client that could be scheduled or bundled together and or compressed better.
It certainly will be interesting to see it once it’s working.