Beautiful, beautiful interface. Worked perfectly smoothly on my MacBook 2.2Ghz with 2GB ram. Am very jealous. Makes the interface of my AJAXified web app - www.gambolio.com - look a tad amateurish. Mine was done using jQuery, btw.
6 months ago I could easy find a jQuery animated effect somewhere that got sluggish if you start generating many simultaneous effects. There is an article by Dave Shea on A List Apart that would visibly choke if you moved your cursor around the links quickly; someone wrote one in Mootools and it was smooth. But I just revisited the article and it wasn't choking anymore.
My hunch is Mootools will still give you an edge. But it might not last long.
You guys are both oversimplifying the animation performance issue.
Alex will probably write slow animations with whatever framework he's using, because it depends way more on how you program than with what.
You have to be cognizant of your DOM, your scripting practices, your loops, etc., etc.
I'm gonna be a total whore and probably get downmodded but, hey, I wrote a book on this exact topic: http://jsrocks.com/ with Thomas Fuchs, the creator of Scriptaculous. (Wait til you see Scripty2.)
Please don't dis other people's code before you have had a chance to look at it, especially when your sole aim is to promote your own product. I am very "cognizant" of my DOM, scripting practices and loops. The reason my animations are slow is the sheer amount I am trying to do with this app, not because I write slow animatations whatever framework I use.
