but I have my thoughts.
These speed tests are useful, but they should not be taken as gospel.They can only give the tester a 'snapshot' of what the situation is at that time.
The factors to be taken into account are, what else is the computer doing at the time, eg other web sites open, file-sharing, downloading, etc, as well as general internet traffic and the current state of your ISP's broadband supply in the area where you live.
General internet traffic is a consideration because, no matter how fast your connection is, if there is a bottleneck ahead of you, this will affect the results.
Your broadband provider is a consideration because that broadband connection they let you use is not yours exclusively. You share it with others in your area, and if there are busy times, eg after school or work each day, then your slice of the network will be reduced.
So, the time of day when you do the test may be significant. What your computer is doing at the time may be significant, and there are likely to be other factors as well. None of these are in your control.
About CNET's speed test I can't say specifically, but I have used it myself on occasion as well as others, and I just use them as an indication of how my system is doing at that particular time.
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