When attempting to add a user or group to a permission list, it takes almost a minute to perform the lookup and add the user/group to the list
Adding a user or group to a permission list takes a lot longer in version 9.7 (up to a minute) than in previous versions. Even adding domain\user still takes time to enumerate the user and add it to the list.
The way Security Explorer performs its domain lookup changed in 9.7. It is querying all domains, even if domain\user is added.
This behavior has been logged as defect ID 17108. The product team will review this behavior for the next release of the product to see if the performance of the query can be improved.