said by Guspaz :

DSLR's iPhone speed test measures both upstream, downstream, and latency. And since the iPhone supports neither Java nor Flash, presumably it uses AJAX. No point re-inventing the wheel.

said by planiwa :

I'll rephrase the essence of my message to minimize possible misinterpretation:

I wish that good ISPs would make available just 4 files of random data on a web server,
for the benefit of those users who want to do their own minimalist raw speed testing,
using modems, routers, etc., rather than complex hardware, software, and configurations,
or other "advanced" resources, or resource-greedy features, which may not be available,
or which may themselves be the cause of the "speed" problems that we seek to diagnose.

256k.dat
1024k.dat
4096k.dat
16384k.dat

[I doubt this is difficult, expensive, or risky.]
That's all. Nothing more.

Quite possibly, absolutely no one else is interested in this.
Please comment, critique, correct, improve, on any part of this.

said by Guspaz :

I tried the new speed test, but it doesn't work on my iPhone; it requires that you manually download a file, and the iPhone doesn't support downloading (or possibly uploading? Didn't try that part, it might support uploading photos or videos) files. I think you need to do an XHR to measure downstream.

said by shubjero :

said by CanerisErik :

It's a fake! I see no spike on the bandwidth graphs