You're correct. It performs terribly. On my 2016 macbook it takes 20.48 seconds just to load the interface from refresh according to Firefox devtools. Yes, a lot of this is network traffic. It's still terrible for a chat app. I have PS4 games that start in 20 seconds.
Here's a conundrum: Cars kill ~30,000 people per year in the USA. Vehicle emissions cause ~58,000 premature deaths. That's a problem. Not bicycles, not E-bikes, not bike sharing programs, not motorcycles, not skateboards, not rollerblades – Cars!