Earlier quoted context omitted.
Their protocol is not encrypted by default, which is an odd choice. And on any smartphone made in the last 10 years encryption should not be a bottleneck in any other way than maybe compression size, which is pretty irrelevant since most of the larger things you are sending will be heavily compressed before encryption (video and images come to mind).
> And on any smartphone made in the last 10 years encryption should not be a bottleneck in any other way.. Telegram is the fastest messenger on my 3 year old phone and is significantly faster than the other 6 messengers on it (some of them are e2ee and some only TLS encrypted.
What you are experiencing is probably "just" UI.