> 25kB is a small smaple to test it responsibly. Some latency may distort 
> the measurment. The image can also get cached.

In the article, I suggest avoiding caching by appending a random URL 
parameter to the image (not so nice but it works).

As for the size, it will have to depend on the situation. In Duke's 
case, he wants to decide whether to show a flash banner. Since the extra 
download is purely decoration, there would be no issue if some 
high-speed users didn't get the flash. It's still useful to have a rough 
estimate.

A very large test image would defeat the purpose -- if users had to 
download such an image to test their speed, they might as well download 
the flash in the first place.

Jesse Skinner
www.thefutureoftheweb.com
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