When posting a link to someone's twitter profile, eg: https://twitter.com/X , the auto-embed goes ham and loads a ton of recent tweets. (This can be spotty, as some embedded profiles will act as though a user hasn't posted anything.)
("Read More" shows 20 tweets embedded in a continuous string)
I personally feel twitter profile links shouldn't auto-embed at all. If anything is to be embedded though, it'd probably be more useful to show a card that mimics the user's profile header, ie: header image, icon, name and handle.