I still test mine on GPRS, because my website should work fine in the Berlin U-Bahn. I also spent a lot of time working from hotels and busses with bad internet, so I care about that stuff.

Developers really ought to test such things better.

Thank you for doing this! I really mean it. We need more developers who care about keeping websites lean and fast. There's no good reason a regular site shouldn't work on GPRS, except maybe if the main content is video.