I've just switched from gmail to fastmail, and I'm not very impressed with Fastmail's iOS app (it's pretty slow to start / open / retrieve emails) or the lack o

I've just switched from gmail to fastmail, and I'm not very impressed with Fastmail's iOS app (it's pretty slow to start / open / retrieve emails) or the lack of offline support it has. TBH, other than the annoying ability to too easily swipe emails left and expose the Archive green button, I really liked the Gmail app - it was extremely fast and easy to use. Anyone have any suggestions on a mail client for iOS? I can use the Apple one (and am doing currently), but I don't really get on with it for some reason...