This article explains why a Salesforce CRM Dashboard refresh may appear slow or take longer than expected. Dashboard refresh speed is primarily influenced by the complexity of the source reports and the dashboard refresh queue.
All source reports must complete before a dashboard refresh can finish. Each dashboard component depends on its underlying report being executed, processed, and rendered into the dashboard. As report complexity increases, the dashboard refresh time also increases.
For guidance on improving report performance, refer to the Additional Resources section below.
Dashboard refreshes are processed through a server-side queue. Refresh requests are handled in a first-in, first-out (FIFO) order. If other dashboard refreshes are already in progress on the same server, your dashboard refresh may be delayed until those requests complete.
Improve Report Performance: Best Practices — Salesforce Help
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