You can see firsthand that big groups actually do work. Take the Monero or Haveno Reto rooms as an example. They are both over 600 people.
They only really work in practicality. If you have big rooms with a lot of people sending messages constantly and you're away for more than a day, your app will be catching up for 30 minutes before it is fully caught up and that is absolutely not a good experience.
When I was trying to access it via the onion services, I did notice that. But trying to access it over the clear net, I have not seen that occur.
Well, that's the problem, everyone should be using the onion services if you're using it for privacy/anonymity. Session does it by default, and yet it doesn't ever get *quite* that slow. In fairness, Session did get bogged down pretty hard because of massive DDoS attacks a few months back, but when that's not happening, it's a lot quicker. My biggest issue with SimpleX really is how it seems that messages take half an hour to catch up. Otherwise, the other flaws are either subjective or minor.
How do you find rooms. I had no idea I could find rooms.
type "SimpleX directory" into your search engine of choice. Once you are connected to it, you just simply type a word and press the send key and it responds with groups that match that word. The Haveno-reto group is not in the directory, but it is on rgeir official site.