I wish I had bought my own domain when I signed up for Fastmail so I could switch more easily. Their web UI usually takes 3+ seconds to load for me on a gigabit connection which is about the same as Gmail, search also takes 2+ seconds which is definitely worse than Gmail. And they haven't upped their storage limit in 6+ years during which the cost of hard drives has fallen 50% or more.

edit: Bulk moving or deleting items in the web interface can take 20+ seconds! It's not that fast, honestly. But maybe there isn't anything better.