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Echofon does it somehow? I'd rather have form over function, but I'm probably in the minority.

Twitterrific has done this for a long time. It was hard to make it perform well, but not impossible.

Still not 60 FPS. :)

Um. What? While, yes, it is more expensive to detect that something is a link than not, it isn't that expensive to do. Neither is drawing an attributed string with Core Text. Yes, its hard. No, it isn't nearly as hard as you're making it out to be.

And making things tappable/highlightable? The tableview isn't scrolling when you're tapping. Detecting a tap and performing some calculations to determine which text run the tap falls on cannot cause scrolling performance to go down.