Slower Than a Sickly Snail!

Oh those rewrites! I'd like to rewrite as fast as Superman. Faster than a speeding bullet. Sadly I often feel  more like this guy here ...

It amazes me when I read about some writers who speed through those revisions and rewrites. I can slash and burn through an editing round pretty quickly, but rewrites take me FOREVER!!!

I'm hoping to get better at this, but I need to let the ideas roll around in my head for a bit before I tackle anything. I have to mull it over, see how the new pieces should fit. It often takes me days before I can tackle rewriting a scene. One scene. *sigh*

Are you Superman or SuperSnail when it comes to rewrites? Any tips?