[NiekvdMaas]

That's the reason they are working on the next-gen mobile client now, code-named Telegram X [1] [2]. In my tests it appears to be faster and lighter, I can't speak for the code though as it hasn't been released yet.

1. https://itunes.apple.com/us/app/telegram-x/id898228810?mt=8 2. https://play.google.com/store/apps/details?id=org.thunderdog...