Dashboard refresh times can vary based on implementation and available resources. As an asynchronous process, refreshes will be placed in a queue & processed once resources become available (similar to asynchronous Apex). Long-running or poorly performing Dashboard Refreshes can make for a bad end-user experience and can also have a business impact if mission-critical Dashboards can't be refreshed as required.
The Signature Success plan’s Proactive Monitoring product will monitor for, and alert you to, sustained increases in dashboard runtimes. This article outlines some scenarios to help you investigate should you receive an alert. In addition, on the Salesforce Help site Designated contacts and above can see your realtime metrics, alerts & more.
Possible scenarios that may impact Dashboard Performance:
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