Dashboards should load quickly because they fetch their data from a cache that renews whenever a query runs. But if you haven’t run the queries recently, your dashboard might be stale. It could even mix old data with new if some queries ran more recently than others. Verify when your visualizations were last refreshed.

Each time a dashboard is refreshed, either manually or on a schedule, all queries in the dashboard and all upstream queries, including those used by parameters, are refreshed. When an individual visualization is refreshed, all upstream queries, including those used by parameters, are refreshed.