You are right, at least, regarding the monitor. I tried two monitors (other factors being equal), got 28, 4, 68 with Dell IPS LCD, and 31, 11, 78 with Samsung TN LCD (paired t-test p-value=0.08). It might be that amount of light or time of day is another factor introducing variance.
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[ 4.1 ms ] story [ 15.8 ms ] threadThe problem with any of these online tests is that it is skewed based on your monitor, graphics card, OS, and browser settings.