I've been performing lots of speed tests lately due to, among some other random things, an Internet programming class and getting Google Fiber hooked up.
Then I realized that SpeedTest.net uses a Flash app; it kind of bothered me that I can't monitor the transmission contents in my browser's inspector tools like regular downloads. What is being downloaded and uploaded for such speed tests? What are the risks with speed tests? (Doesn't have to be SpeedTest.net-specific; maybe speed tests in general if they're not all so different.)