That screenshot shows that its only downloading the API data from our server for WOW which are small files that list what AddOns we have available for WOW. If it was trying to detect the game or its addons it would say "detecting WOW addon <addon name>" and it would scroll really fast.
We are working to make that not happen.
Just be aware though it does not take much resources for this so when its fixed you won't see much difference if you are having resource issues. When the loading progress pauses on something its usually paused on something that isn't shown yet in the progress window. We are also working on making the load progress messages more informative.