A PROD ready website developed in 100% elm

It’s great to see elm-ui in production! Is the entire site in Elm, like the view truck and login? And what is the backend technology used?

I am accessing from a very old computer right now, on Google Chrome. When I expand/collapse any filter from the home page, I notice a ~250ms delay, and I am not sure if it can optimized or if its my computer that is slow.