Since the 3GS (and 3rd generation iPod Touch) has both more RAM and a faster processor, you don't see checkerboards much. You still see them a lot if you scroll

Since the 3GS (and 3rd generation iPod Touch) has both more RAM and a faster processor, you don't see checkerboards much. You still see them a lot if you scroll while the page is loading. An example, I just did: take a big, long, complicated page with lots of Javascript (say engadget.com, the regular non-mobile version) and wait until Safari is 100% done loading. You can scroll at skimming speed and I only saw the checkerboards once. But if you scroll like a madman trying to get to something near the bottom, it'll still checkerboard and make you wait for the roughly 500 milliseconds to render.