We apologize for the slow loading times! It is a new setup, so there could definitely be a few things to iron out along the way. It could also simply be that the link was not correct for a particular popup, in which case it’s our fault! We have been going through every single new link over the last few days to test accuracy, so hopefully we find all the duds!
As for the visual indicator, we could possibly do something like this (for the structure pages), but for regular sentences in study, the main objective would be not to show them (at a glance). This is mainly because it would become a visual reminder, and potentially rob you of the opportunity you had to remember/recognize the grammar point yourself (strengthening your recall for the future).