I'm with the other comments here, but what's the deal with the '120 fps scrolling' blah blah blah? This clearly isn't a game or movie -- why are we talking about frames?
Hey, I should have maybe made this more clear - I definitely don't care that it's 120fps more that the frame rate doesn't drop and we aren't seeing freezes. Initially the project was, with large files, with syntax highlighting especially or switching very large branches. The built-in FPS counter actually proved really helpful in observing these.
Just to add to this, I also observed in some of these cases the frame rate dropped in a non-transient way on that it remained low. I think this should be covered by more of a soak test but it has still been very useful for me to see a constant fps.