bCourses & bSpace site memberships don't get changed manually often, but when they do, the circumstances can be stressful. ("I need to see the quiz! I need to see tomorrow's reading! I need to grade papers!") Could we try lowering the lifespan of CanvasUserCoursesProxy, CanvasGroupsProxy, and SakaiUserSitesProxy some & seeing if the performance costs are too high?