I\'ve taken to using rem\'s to size fonts in recent projects, then using px as a fallback for older versions of IE.
rem
I\'ve also been setting a font
font
The * selector is very slow, as the author of this bug in Chrome, I'd advise a workaround like this until the bug is fixed:
*
body > div { font-size: 1.4rem; }
Provided you always have a wrapper div anyway ;)