.profiling-css ul li { margin-bottom: 5px; } I’ve been recently working on optimizing performance of a so-called one-page web app. The application was highly dynamic, interactive, and was heavily stuffed with new CSS3 goodness. I’m not talking just border-radius and gradients. It was a full stack of shadows, gradients, transforms, sprinkled with transitions, smooth half-transparent colors, clever pseudo-element -based CSS tricks, and experimental CSS features. Aside from looking into bottlenecks on Javascript/DOM side, I decided to step into the CSS land. I wanted to see the kind of impact these nice UI elements have on performance. The old version of the app — the one without all the fluff — was much snappier, even though the JS logic behind it hasn’t changed all that drastically. I could see by scrolling and animations that things are just not as quick as they should be. Was styling to blame? Fortunately, just few days before, Opera folks came out with an expe
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