Performance issues for regular users

I have a strange situation... and I wasn't sure if this was the right place to put it, but I figured I'd try.

We've come across a strange issue where if a user is set as a regular user, it takes up to a minute for them to access the Accounts page, and roughly similar for Contacts, etc.

If I or the other admin log in, it is up in under 7 seconds.

As an experiment, I upgraded a user from a regular user to a System Admin user and the Accounts page loaded in under 7 seconds.  Put them back as a regular user and it went back to taking almost a minute.

I'm at a loss, unfortunately, since I don't know Sugar very well.  I've more or less ruled out its being a back end database or server hardware issue, since it seems tied to a role.

Any help would be appreciated.

Thanks!