The Security Policy of the user account being used does not have the appropriate privilege to take advantage of volume management on the system, which may lead to reduced performance than if it did have access.
The specific Windows authorization Privilege Constant is SE_MANAGE_VOLUME_NAME, which controls the ability of the account to perform volume maintenance tasks.
If the account does not have access to this privilege, and when running the tool the process needs to use a temp file, performance may suffer.
If you encounter this issue, contact your System Administrator and discuss being granted permission to make the appropriate changes. Be careful to ensure any changes are performed carefully and correctly, and consider making appropriate backups before commencing them. Esri assumes no responsibility in the configuration of the systems of end users.