Excel 2013 documents opening slow in SharePoint 2013

Using Office 2013 (15.0.4701.1001), often excel documents would hang for 20-30 seconds. Microsoft suggested the following key be added to the end user registry:

1. Open regedit.exe
   Navigate to following key:

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\15.0\Common\Internet]

1. Click Edit Menu -> New -> DWORD with name of "FSSHTTPOff" (without quotes)
2. Click on "FSSHTTPOff" and enter value of 1
3. Close any Office Applications and browser sessions

Please use at your own risk.