Speed ranking is not bad, very very very bad. That means problems with serach engine ranking, user experience and using most of the features. You can;t use them because you are afraid your page will take one minute to load.
One star for not optimizing the theme, just focusing on adding more and more with no tuning to existing errors and code. Also the problem is raised by users for some time now(1 or two years from what i saw).
Otherwise the team is good, but I don;t recommend you to buy it if you are searching for a template to use for a long time. Just imagine if now it;s working this bad after a few more features added what will happen. Cheers,