Updating all exam data on each feedback option check is too slow
CC @MrHug here.
!100 (merged) has improved the user experience by updating the feedback options every time a single one is checked. However the cost for achieving this was rather high: we now get all exam data every time a feedback option is checked, and that becomes very slow for large exams.
As a hotfix I will revert the fetching of all exam data (there were multiple complaints about the performance regression). Then as a follow-up step we should update only rubrics when the user clicks on one of them.