Slooooow Down v1.5.0.5

Overnight TB slowed to a crawl.
Program load takes "forever", message loading is slow, Delting a msg is real slow.
Did Compact Folders.
Seems that I remember that deleting a file in each folder that will be rebuilt on startup fixes this problem.
Am I having a "Senior Moment" or is there a such a delete a file fix?
Regards,
Frank