About Cached Reports on Dashboards
When you run a report, the console takes the scope of the report, and checks if the cache contains the same report, for the same scope. If it does, the results are displayed from the cache. If the combination does not exist, the report is run from the database, saved in the cache, and then sent to the user interface.
When a report is served from the cache, an indicator icon is displayed on reports and dashboards. You can roll over the indicator to show the age of the report from the cache. Click the icon to rerun the report from the database.