The debugger and the source map loading are noticably slower. The DOM browser is slower as well and I get things shifting a few pixels up/down randomly in there

The debugger and the source map loading are noticably slower. The DOM browser is slower as well and I get things shifting a few pixels up/down randomly in there. On the bright side, it keeps a running diff of the css changes you make. Super useful when you're trying to fix some stupid layout thing, get it working and then forget all the changes you made.