Unfortunately also an old, very old problem that many of us seem to think is a feature of eM Client: if I want to reply on an email of our Exchange account, it can up to 10 seconds before the original text of the message is loaded. All this time the email window is totally blank.
Our Internet is fast (really fast), so is my computer. It also happened on my previous laptop, so even reinstalling did not help.
Does eM Client have a problem with large email databases? I manage several mail accounts on this system with more than 20.000 emails.