As far as you people thinking the code is that easy to get to, it's not. Customization on the front end has NO bearing on optimization on the back-end (whether it be PS changes, or codepath changes to say what renders what
Um, it's program code, its as easy to get to as opening whatever dev tool was used to create it and accessing the source code or objects. Writing that code might require some skill, but getting to it certainly don't.
On the performance issue, I do think it has improved recently. I've never had the stutering problem, other than thrashing from the memory leak after time, so I have no idea as to that, but the frame rate does seem to have improved somewhat.