The interface is laggy in a way that HTML/JS (when correctly done) are not.
Interface lag when I drag things means I'm never going to use it - it can't compete against the many good desktop apps out there for me (plus, being flash means it wont work on my smartphone and iPad, which would have been a case for giving up on desktop apps) HTML/JS apps can have a ton of lag in sending things to the server before it gets frustrating, but dragging something and having it not move until a little bit later is too frustrating for me to use.
Take that with a grain of salt, though, I'm one of the people who get's extremely frustrated when having to use monitors not at their native resolutions (curse you DVDs on HD screens!)
Interface lag when I drag things means I'm never going to use it - it can't compete against the many good desktop apps out there for me (plus, being flash means it wont work on my smartphone and iPad, which would have been a case for giving up on desktop apps) HTML/JS apps can have a ton of lag in sending things to the server before it gets frustrating, but dragging something and having it not move until a little bit later is too frustrating for me to use.
Take that with a grain of salt, though, I'm one of the people who get's extremely frustrated when having to use monitors not at their native resolutions (curse you DVDs on HD screens!)