In reply to SF.

Thank you for your post. Please note that the performance issue is associated with how long it takes to flush the original file out of memory. Flushing memory is not done by SAS, but by the operating system's flush daemon. If you feel that this daemon should work faster, I suggest that you work with your operating system's support team to see if there are any tuning parameters that can be set to make this task run faster. If you learn of any, please share them with this community.