CSS - Optimizing rounded corners for speed

Question

I'm trying to optimize my site for speed. I used images for the rounded corners before but now I've changed them with border-radius and -moz-border-radius css rules. Which way is the best for speed? I used to think that css rules are faster but I've seen a lot of sites talking about css sprites and I'm a bit confused now. Oh and I don't care about IE compatibility so you can suggest any method you want.

Answer 1

The speed goes like this: CSS > sprites > separate images. The sprites is when instead of having separate images for the corners you use a single image and slice/position it with CSS. It's fatser, because you only download one image then. CSS is the fastest, because it doesn't need to download anything.