Consistently, it's taking around 5 seconds to fetch the initial page for any of the lessons.  Here's an example for Lesson 1, Fundamentals 1:

This happens every step in every lesson which makes for a pretty clunky experience if I'm flicking through lessons trying to find the right one.  While I realise some of that page is dynamic for the user, most of it isn't.  Please could you think about speeding this up?