Flash-based broadband test program supplied by DSL Reports.
Tips:
This speed test measures how well your computer can communicate with a web site. The result will be 12% to 17% lower than your actual connection speed, because your data must be placed in an envelope called a packet header. This overhead is necessary in all Internet traffic.
Your speed might also be impacted by the working condition of your computer, such as:
Software or hardware problems (including damaged cables).
Running other programs, such as iTunes.
Sharing your Internet connection with other computers.
Running the speed test over a Wi-Fi (wireless) connection.
Using an older or problematic web browser. Try using Firefox.
Using a virus-infected Windows computer. Scan your system for free with AVG.