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If activated API Gateway Manager will import groups and users that are associated with the identity providers found. When turning off you will loose the ability to migrate any such groups or users. Instead they will show as "Missing on source" during a migration.

Use Graphman instead of Restman to interact with the gateways

Use Layer7's new Graphman interface for communicating with the gateway. As not all resources have been implemented by Broadcom, the Restman is used as a backup. Graphman dramatically reduces the time required to reload the resources of a node.

https://apiida.atlassian.net/wiki/spaces/AAGM/pages/1534034010/Resources#Reload-Resources