Jon Sykes » Blog Archive » Testing CSS Performance (pt 2)

Which looks like: The green bar is the average time that the page took to render when you use 20,000 direct class name css declarations, the blue is the same but using lots of descendant selectors with the class name (see the example above). You can clearly see the trend that single class name declarations are faster. But what really amazed me was how much that seems to impact Safari and to a less