I haven't used Racket much since the CS rewrite, but it's slimmer now, isn't it? I remember Racket feeling a bit chunky when I was using it more, years ago, but I thought part of the rewrite was to address that (among all the other benefits).
You mean the speed, the installation size or the default editor?
The default editor (DrRacket) has a lot of add-ins enabled by default and also support for graphics and debugging. It's possible to disable most of the extensions so it load faster and also disable debugging to make the programs run faster (in exchange of less helpful error messages).
