I can't really speak with much authority one way or the other with regards to the speed of Emacs on win32. I use Emacs minimally on Windows XP under VMWare (Mostly to keep my .emacs working in both win32 and Unix), and it seems to run quite well there.
I don't use projects myself, but oliverp pointed out Emacs Development Environment. I have not tried using it, so I don't know how well it fits your requirements.
I am a very big fan of the Speedbar. Since I began using the Speedbar, I've pretty much stopped using folding. It pops up a nice little frame with a list of files and folders. If you drill down into a file that it understands (like a perl script) it will show you a list of all your subs so you can jump to them with just a click. I don't tend to mouse much unless I am not sure of the name of the function I am looking for, and for that purpose this works very well.
The Emacs Wiki is a very good place to find out just about anything you ever wanted Emacs (and probably lots of stuff you really don't ever want to know :p).