Webmail 16 Slow - SmarterTools

Hello,
We upgraded SmarterMail 15 to version 16.
But the same is too slow to load pas folders.

Webmail does not automatically update itself when we receive an email, so I'd rather give an F5 in the browser to update or toggle between one folder and another.

Another problem is that in the spam folder it does not show the amount of unread emails as it shows in the inbox.