I believe SSO is partially working on some of our AD accounts but others it seems it either times out or they just get a login screen.  

For the accounts which do work, it seems like the browser churns for a good 20 seconds and finally loads.  Then if I log out and close the browser, open it back up and try again, SSO instantly works and the user automatically logs in and sees their home screen inside SD+.  

Does anyone have any suggestions as to why it could be so slow for the first time?  Again, it feels like things are being cached which instantly loads the next time.  But then after time, it is back to being slow again. 

Thank you for any suggestions.