When importing large amounts of data from AWS that involve multiple accounts and regions, the AWS Asset Import process can take considerable time, particularly during the decision-making phase of the action steps involved in the import.

The reason is that "outboundReference()" is executed because "Caller Identity" is used as one of identifiers of object types in AWS import configuration. The Object mapping AQL

"AWS Account Id" IN (${Caller Identity${0}})

Reference: AWS data imported into Assets

It would be helpful to review the current AWS implementation when importing a lot of data from AWS accounts