I've had good success with rendering out the network at different resolutions, chopping up the image and putting them as tiles for leafletjs. The cutting is pre

I've had good success with rendering out the network at different resolutions, chopping up the image and putting them as tiles for leafletjs. The cutting is pretty easy, there are some libraries but a bit of basic scripting with imagemagik can also solve it. You can then add points/etc like a regular map, it'll load quickly and work on devices how users are used to.