While there are other sources of inaccuracies the most significant in our view is that the file size is far too small particularly given the inaccuracies of timing the download in. They calculate this speed by timing the download of a single image file using 75 Javascript. For a 12 Mbps with Powerboost to 15 Mbps connection, CNet exclusively measures the download speeds as being below 2 Mbps (see Figure 13). (Incidentally, this transfer occurred on a 12 Mbps connection with 15 Mbps Powerboost.) We find the CNet bandwidth meter to be wildly inaccurate. Evidently, Internet Explorer rounded up to the nearest second which for a short file transfer of 5MB represents a significant time increase impacting the overall measured speed by more than 6 Mbps. What is interesting is that the packet capture shows that the transfer actually occurred within 2.2 seconds implying a throughput of 19.7 Mbps. When downloading a file in a web browser, the total transfer speed is often presented at the end of the connection like in Figure 12 below from the Internet Explorer which notes that the 5MB file was transferred in 3 seconds which is displayed as 1.66MB/sec or 13.3 Mbps. searches for “broadband speed test.” While the ones we consider here don’t feed into any aggregate statistics, they are often seen and noted by end-users.
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