Hello

The user clicks to the calendar symbol and he needs to wait 5 to 10 seconds fot the data.
Then he clicks to "day". The calendar will be loaded very quick. Then the calendar goes to grey and the spinner is runing for at least 10 to 20 seconds. The users are using shared calendars .
Looks like, that something will be reloaded in the background.

Compared to version 15.x the calendar is too slow. Some users are using the webmail to whole day and their are now more than unhappy.

Cheers!