iPhone Version Issues

The iPhone version of this app really needs to be fixed. My friends with androids don’t seem to have these issues, but my friends with iPhones have the same issues that I do. The app takes awhile to open, then when I tap to open a conversation, that takes forever to open, then it is usually just white for a long time. Then when the messages do load, they’re all old. The new messages take a really long time to pop up & sometimes the app just crashes before they ever do. Any message I send takes FOREVER to go through if it ever does and you can forget about sending any pictures, it just won’t ha