updates

Author: maertendMSFT

articles/cloud-shell/persisting-shell-storage.md

@@ -68,9 +68,14 @@ Cloud Shell machines exist in the following regions:
 |Europe|North Europe, West Europe|
 |Asia Pacific|India Central, Southeast Asia|
 
+Customers should choose a primary region, unless they have a requirement that their data at rest be stored in a particular region. If they have such a requirement, a secondary storage region should be used.
+
 ### Secondary storage regions
 If a secondary storage region is used, the associated Azure storage account resides in a different region as the Cloud Shell machine that you're mounting them to.For example, Jane can set her storage account to be located in Canada East, a secondary region, but the machine she is mounted to is still located in a primary region.Her data at rest is located in Canada, but it is processed in the United States.
 
+> [!NOTE]
+> If a secondary region is used, file access and startup time for Cloud Shell may be slower.
+
 ## Restrict resource creation with an Azure resource policy
 Storage accounts that you create in Cloud Shell are tagged with `ms-resource-usage:azure-cloud-shell`. If you want to disallow users from creating storage accounts in Cloud Shell, create an [Azure resource policy for tags](../azure-policy/json-samples.md) that are triggered by this specific tag.