Canvas suffers from being originally designed for use in elementary (K-12) school, and then kind of wedged into college. On the teaching side it kind of assumes that classes will always be relatively small (running a 100+ student seminar class in Canvas is a nightmare) and that you, the teacher, don't mind performing the same actions over and over and...

But, it's one of the few LMSs designed post-Web 2.0 so things that require a refresh or reload in BB, etc., generally happen much more smoothly.