Enumeration of %1 entries for the ACL of folder %2 in database "%3" failed with error %5, and took an abnormally long time ...

Enumeration of %1 entries for the ACL of folder %2 in database "%3" failed with error %5, and took an abnormally long time (%4 seconds) to do so. This latency may be indicative of the folder having too many child folders with differing access rights. It may also be indicative of performance problems with your hardware.