OS X Server File Sharing slows down some time around 5 PM

We have a problem with our OS X Server file server becoming sluggish to browse and save files around 5 PM each day.
Historically we had this problem with Mac OS X Server 10.5.8 but it's also seems to be a problem with our new Mac Mini running OS X Server 10.10.
We have one IMAP account on the server that we use to archive about 18000 emails at 12 GB, stored under a number of folders. Could it be this that's causing the problem? I noticed on our 10.5.8 server that it used to process the email and use up gigabits of HD space in the process and then release it all again when it was done. The sluggishness seemed to coincide with this.

I know there are options in the policies section of the Open Directory area of Server Admin.  Or, in Server App, you can click on Users and then if you click on the little gear thingy under the window displaying the users you can choose Edit Global Password Policy and a drop down window will show the same settings.

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