The discussion of the crypto speed

I used to think about crypto transaction speed. And sometimes it’s an extremely long procedure to see it done. Maybe, it’s one the main reason, why the crypto traiding hasn’t conquered the whole world. An interesting article explains this situation It says that there are some risks and difficulties which are stopping the exchanges from really fast transactions. I hope some exchanges are able to resolve that issue. I used to trade a bit and I see that some btc or eth operations could take days to finish. Wha’d you’ll think? How to escape from long and slow transaction?