Hi @ksenstad,
Hope this message finds you well! Based on this article discussing all of the metrics for Quick Sight, DashboardLoadTime looks like the determining factor representing full dashboard readiness and utilization capability. It is difficult to say conclusively why certain dashboards can take a while to load, but I would definitely look into this other article that mentions some common factors to long wait times and how to potentially mitigate those issues. Let me know if this helps!