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Old 16 May 2017, 04:47 PM   #6
BritTim
The "e" in e-mail
 
Join Date: May 2003
Location: mostly in Thailand
Posts: 3,084
Under most normal circumstances, the UI is more responsive with the modern interface than with classic. That holds even when the network connection is rather slow. However, it is a fact that these kinds of asynchronous interfaces are sensitive to network disruption and lost packets. The old classic interface can be affected too, but to a much lesser degree.

The network speeds you cite, while not very good by today's standards, should be quite adequate for purposes like email, but a short-term network overload leading to lost packets (which I suspect is the cause of the trouble) will mess up the handshaking between your client and FastMail.
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