Hi guys.
I’m not sure if that’s the best place to report that, but I’ve noticed that the website can be a bit slow. For example loading https://www.justinguitar.com/classes/beginner-guitar-course-grade-one can take more than 3 seconds on my computer. My guess is that loading user profile/data is a bit on a slow side - I’m not sure how your system is built but I 'm pretty sure that you fetch user data from some database(s). 3 seconds is not the end of the world but it is pretty noticeable.
Some technical details/test: to validate that you can run a simple test using ‘curl’ command:
curl -w "%{time_total}s" -o /dev/null -s https://www.justinguitar.com/classes/beginner-guitar-course-grade-one shows typically times under 0.5 second.
curl -w "%{time_total}s" -o /dev/null -s https://www.justinguitar.com/classes/beginner-guitar-course-grade-one -H "Cookie: justinguitar=<cookie value>"- shows typically times over 3 seconds.
The second test passes a session cookie that I wager will trigger some extra processing/data loading on your end (instead <cookie value> one need to pass the real session cookie value, grabbed e.g. from the web browser inspector).
Obviously that’s just my guess what happens - there may be many other reasons for that 
. I’m located in Europe/Poland, if that matters (CDNs etc.).