Just some notes on the reaction time testing
Test #1 is the most accurate reaction tester.
Test #2 adds a little hand eye coordination to the mix, but don't take this test too seriously because it's highly contingent upon how well you are accustomed to mouse sensitivity. For example, if you do test #2 on someone elses computer, you'd score lower since you aren't used to the combination of mouse speed and screen resolution.
As for test #1, it has been very consistent over the years with any browser and almost any speed computer. I have noticed that really old computers (Pentium II's or older) seem to record your reaction times slightly slower. But anything over 1 ghz should be very accurate from computer to computer.
In person, I've seen many people test their reaction times over the years and the average times I've seen is .25 - .33 seconds. This is accurate with national statistics stating the average person's reflex time is about .25 of a second. So, if you are faster than that, congrats! You've got fast reflexes.
Don't forget to press start, then immediately press and hold the stop button. Release the mouse button when the background changes color. This tip will eliminate the time it takes to press down and release. Releasing your finger off the mouse button is about as accurate as it can be.