another nice thing you can do with delta chat is having in-chat tools like shopping lists in the family chat where anyone can add or mark an item as done and is marked for everyone, collaborative text pad, to-do lists, split bills, mini-games etc. you can even write your own small utility apps and share it in the chats and your contacts will be able to use them in all platforms

the speed is of chatting is realtime if you use the optimized chatmail relays instead of classic email