> This is pretty interesting because the extends certainly result in DRYer CSS, which I think most of us would have figured to perform better. I'm not so sure.

> This is pretty interesting because the extends certainly result in DRYer CSS, which I think most of us would have figured to perform better. I'm not so sure. Matching selectors to the DOM is a time consuming process. So more selectors, more time spent. I think parsing the rules is fast in comparison.