There are some long running tasks that run once after upgrading. We have some cleanup code that runs once relating to conference rooms, there were issues in 15 with conference rooms losing what event they were bound to so we run a task that cleans them. This requires checking every calendar for every user for each domain. It's pretty fast but if you have a lot of users it could run for a bit. We also have a similar check for file storage.
You can check to see if the conference room cleaner has finished by checking for this line in your mailConfig.xml
"<cleanedOrphanedConfRooms>True</cleanedOrphanedConfRooms>"

New installation with just a few users, and it's still slow loading/editing contacts.

 

Can you duplicate IE problem with closing the window?

 

Also, here's another issue. When you load a picture for a contact, it stretches or condenses the picture to fit the square box which makes the person look funny. This happens with all browsers. For example, when I load this pic of the president into my contacts, it shrinks to make him look skinny.

 

This didn't occur in SM15. Most photos are not square, so can it just crop it instead?

Just following up on this thread. Using the Jun 9 build, still noticing these issues:

None of these items occur in SM15. Thanks.

Hello? Not sure why this thread doesn't get any acknowledgement. All the issues still exist in Version 16.0.6376. Is it because IE is no longer supported? Just let me know and I won't bother with providing feedback.

 

Suggestion: with weekly builds it would be nice to have the date in the version as it's more meaningful than a build number:  Version 16.0 - Jun16