Does Coffee Actually Make You Faster? Test It Yourself

Everyone knows coffee makes you faster. But how much faster, and at what point does the second cup make you jittery instead of quick? A reaction test turns a feeling — "I'm more awake now" — into a number you can actually compare. You don't need a lab. You just need a baseline and a timer.

The Baseline Is the Trick

The hard part of any self-experiment is knowing where you started, and knowing it reliably. Before your first coffee of the day, take a reaction test five times and note your average — that's your baseline, groggy brain, no caffeine. Then have your coffee, wait twenty minutes, and take the test again. The difference is the actual effect of the coffee on your body, not some average in a study. The counter-intuitive part: most people are surprised by how small the difference is once they measure it. The feeling of being awake is much bigger than the measurable improvement in milliseconds.

Run the Experiment Properly

To make the results mean something, control the variables. Test at the same time each day. Use the same number of practice rounds so you're not just getting better at the test itself. Use a time screen to measure the gap between the coffee and the test, and keep track of the numbers with a scoreboard so you can see the trend across several days. If you really want to go deep, try the same thing with tea, energy drinks, or a cold shower and compare. The point isn't to publish a paper — it's to learn something about your own body that you can actually use.

What You'll Probably Find

Most people see a measurable boost from one cup and diminishing returns from a second. More than three and reaction time actually gets worse, because jitteriness costs more than alertness gains. We covered reflex training in our guide to pro gamer reaction times; the home version is the same idea scaled way down. Grab a baseline, test the coffee, and find out for yourself whether your morning ritual is actually working. Just don't turn it into more stress than the coffee saves — the goal is information, not a new performance metric to optimize before breakfast. If the difference is under 20 milliseconds, you probably can't feel it anyway, and the ritual matters more than the number. Use the test to learn about yourself, not to turn every morning into a competition with yesterday's you.