If you want to know how much CSS selector matching (sometimes called Style Recalculation) is affecting your site you can try Speed Tracer: https://chrome.googl

If you want to know how much CSS selector matching (sometimes called Style Recalculation) is affecting your site you can try Speed Tracer: https://chrome.google.com/extensions/detail/ognampngfcbddbfemdapefohjiobgbdl https://chrome.google.com/extensions/detail/ognampngfcbddbfe... It's Chrome-only but you can sometimes get cross-browser insights. It's also a lot easier to conduct a cursory investigation using this tool than it is to start changing your selectors.