Cold start and warm-up optimization
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See Managed Cloud Standard best practice suggestions to learn how to use Application Initialization features for warm ups in Azure. The information is specific to Azure App Services but works for an on-premise installation as well. In Azure, when scaling out, Azure will run through this warm-up before rotating in new instances. For additional information, see Application Initialization.
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Enable Always On for Azure App Services to prevent cold starts.
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Use warm-up modules or automated pings after app pool recycles:
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Azure Functions
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PowerShell scripts with scheduled tasks
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For more information on tuning Sitecore in Azure, see Recommendations: Sitecore tuning in Azure.