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It can be more accurate, but it can also be less so. And while I'll agree the instructions are fine, and no speed test is definitive, that particular test is much more vulnerable to being skewed by factors such as the user's machine and the timing of the user's actions. Having to manually add up four numbers that *will* be actively changing and counting on an end-user to accurately do math adds extra variance factors. It might give you a ballpark figure, but that's it, and it's definitely prone to over-estimating speed rather than underestimating, which may be why VM like it so much...