Login Slows to a Crawl

I’m new to using Open Directory and OS X Server in general, so I’m not sure if this is an actual problem, or just “the norm.”

I have an ODM installed on a 2010 Mac Mini (8GB RAM) with a Gigabit connection to the local network. Upon trying to log into any network account (typically 3-5 people logged in at a time) it takes a VERY long time even to load home folders that are pretty small (I mean up to 3 minutes at times). If you initially log in to a local administrator account on one of the machines, delete the OD and then re-add it, all the accounts from then on out log in nearly instantly. When the machine reboots, the slowness returns. Is there something I’m doing wrong or is this typical of this particular setup?

Thanks for the help I’m sure I will receive! 🙂