Actually, this isn't just one Web page, it's two Web pages, each
with a hidden data file in the header area of the page. When either
of these pages loads, it notes the time just before and just after
the data file loads, then uses this information and the size of
the data file to calculate the rate at which the data arrived at
When the first of these two pages was loaded, it did a rough calculation
using a small data file to provide an estimate of how long it will
take the second page, with its much larger data file, to download.
The second page, with its larger data file, allowed the second page
to calculate more accurate figures for the Your Speed:
box and Speed Test Thermometer above.
Why do I get different speed results
each time I run The Bandwidth Speed Test?
Like any major highway system, the Internet information highway
has many roadways and interchanges, each with their own capacity
and speed limit, and, like highways for cars, sometimes you get
traffic delays. Just as you have to wait in a your car while other
traffic goes through at a traffic light, data sent to your computer
has to wait while other data passes through routers, the Internet
equivalent of an intersection, on it's way to you.