Agree. Very slow here too. I get stuck on the connect.xfinity.com/appsuite/ page and then a message that the service is not available now with a "retry" link. It's been a few weeks so we're due for the usual comcast email problems.
Why should we pay for this misuse of our time? Email apps are not new computer science. Other services (free) don't have these problems. Why are we paying you xfinity?