Speedtest.net Not Accurate?

[unattended]

I have always used this site in the past, but I just recently got fiber in my house and the speeds were registering way lower than I was getting both in uTorrent and getting as a result from Verizon's speed test site.

Speed-test (http://www.speedtest.net) has been telling me anything between 5 and 10 megabits/second download, while in uTorrent I'm seeing the expected 15 megabits/second and also getting that from Verizon's speed test (http://www.speakeasy.net/speedtest/).

The upload has been pretty consistent from all sources.

Anyone else notice something similar?

[tesco]

It depends on how far you are from the test server and how busy it is.

[LaPistola]

also the java based one is much more accurate than the flash based one

Edit- yes the one you are using is flash based. try going here:
http://www.dslreports.com/speedtest