Apart from the var regions the map appears to be very slow to load the tiles, especially when zoomed out. It looks like it's loading just every single region instead of the zoom levels though. The map- levels can be requested from robust directly, which would speed up loading as it doesn't have to load each regions tile, just the zoom level specific one. Something for the future I suppose. I have some javascript code for that you can steal if you get around to it

I agree that vars are a bit of a hack at times, especially in regards to scaling various features. Documentation is lacking, that is true and unfortunate. What parts are missing that would help with var region support in the future? I can certainly dig in and amend documentation, happy to help!
