Those aren't as bad, about 20 seconds to get going from a cold cache. Car Configurator is incredibly slow though, I timed it at about 8 minutes to load from scratch and when it finally got there it was unusably laggy until I refreshed and let it start again with a pre-warmed cache. According to Chromes internal task manager the CarConfig tab is continuously using about 500% CPU (i.e. five entire cores) and 5GB of RAM despite very little going on in the demo. This is on a current-gen desktop processor.

That's pretty neat, not much in the way of progress bar for me but they load in about 30 seconds. And it seems a little choppy at times but playable. Reminds me of late stage flash era games.