Works beautifully!

There are some things the renderer doesn't seem to bother with that make the map feel quite empty right now – addr:housename, hedges, fences, walls, trees, car park areas, buildings under construction, some POIs (though I've not worked out which).

The colors also feel a bit bold and saturated, e.g. the pink of a retail area and the green of a forested area, but the hex values are the same so I'm not sure why I'm getting that effect.

But I'm excited about the fast loading, about being able to zoom enough to distinguish things that are close together, and about the potential for this to allow for map interactivity that's more intuitive than the "query features" function.