I found that if you disable the "Startup Screen" for Word, Excel, PowerPoint, etc. in Office 2013 it goes from taking 5+ seconds to load to only a second. You must do the following for each one:
- Launch the Office application
- File tab
- In the General section
- Start up options pane
- Uncheck "Show the Start screen when this application starts"
- OK button
- Repeat for any other Office applications