Microsoft Office 2011 is sluggish
Two things you can try : 

1) Make sure you have the latest updates installed.  Office 2011 has been updated since release, so it pays to ensure the latest versions of all applications are installed.

2) Perform a Repair Permission on your Macs hard disk.  This has been known to cure slowdowns in a a few Applications including Office 2011.  Repair Permissions is a feature of Disk Utility found in the Utility folder in Applications.