mIRC isn't just making stuff up, those messages are received from the server. There's nothing to fix. Twitch has terrible IRC support.
I find it hard to believe that in the past week something changed in twitch and is duplicating hundreds of thousands of join/leave messages every second. Could this have anything to do with the fact that i upgrade to windows 10? Last week this was not happening on windows 7.
or you can use raw, but i dont remember what one go where. Look it up on google..
This is untested.
I need to see the join/leave messages, and don't want to hide it. Will this just hide the duplicate join/leave messages? or will it hide all join/leave messages?
This will hide the messages from the server, but you will see all op's and so on done by a person, test it and see how it work, if not, then just remove it.
Put the code in remote "ALT + R" in your mirc, close and you are done.
if ($me != tired) { return } | else { echo -a Get a pot of coffee now $+($me,.) }