Speedly measures one of the most stable physiological numbers your body produces: the time it takes from a visual stimulus to a finger press. Most people score between 200 and 350 milliseconds, and most people are surprised to learn how much that number swings during a normal day. Sleep, caffeine, posture, screen size, and even what you ate for lunch all show up in your Speedly score. This is a guide to pulling your average down by 30–60 ms — which is a huge swing in a game where the world's best players sit around 150 ms.
Reaction time peaks in your early twenties and slowly declines thereafter. Rough averages from published reaction-time studies on visual stimulus tasks:
If you score significantly below your age band, you're naturally fast. If you score above it, the good news is most of the gap is fixable with sleep and posture, not training. Speedly on Gamezio displays your best, average and last attempt, which is the only data you need to track real progress.
The three most reliable factors that change reaction time on a given day:
Sleep. One night of poor sleep (under 6 hours) typically slows reaction time by 30–60 ms. This is bigger than the effect of any drug, training, or warm-up. If your Speedly score is suddenly 80 ms slower than usual, sleep is the first place to look.
Caffeine. A 100–200 mg dose (one cup of coffee) speeds reaction time by 10–25 ms in caffeine-naive subjects, less in regular drinkers. The effect peaks 30–45 minutes after consumption and lasts about 3 hours. Don't expect a second cup to stack — it usually doesn't.
Posture. Sitting upright with both feet flat and forearms supported produces faster reactions than slouching or leaning. The mechanism is simple — better posture means less compensatory muscle tension, which means cleaner motor signals. This is the single biggest controllable factor on a given attempt.
Before your Speedly attempt: sit upright, feet flat, take three slow breaths, hover your finger 1 cm above the screen or button, look at the centre of the target. This alone is worth 15–25 ms versus a cold start.
Speedly is a pure reaction game — the stimulus appears at a randomised interval to prevent anticipation. But the brain still tries to predict. If you "click early" you get a false-start penalty, and if you wait too cautiously you give up 50+ ms. The optimal mental state is loose readiness: relaxed body, eyes fixed on the target, finger hovering. Don't tense up. Tense muscles produce slower contractions because the antagonist muscles have to release first.
Top Speedly scorers describe the state as "expectant but not ready" — paying attention without trying. If you find yourself counting in your head or holding your breath, you're tensing up. Reset and try again.
Touchscreen taps add 20–40 ms of latency compared to a mouse click. This isn't your reflex slowing down — it's the touchscreen hardware. Capacitive screens take longer to register a touch than a mechanical mouse switch takes to close a circuit. If you want your fastest possible Speedly score, play on a desktop with a wired mouse. If you only have mobile, pick the same device every time so your scores are at least comparable to each other.
Display refresh rate also matters. A 60 Hz screen has up to 16.7 ms of inherent visual latency between the stimulus appearing and your eye seeing it. A 120 Hz screen halves that. The same player on the same hardware with the same prep can score 15–20 ms faster on a 120 Hz display than on a 60 Hz one.
Cold-start reaction time is 30–50 ms slower than warmed-up reaction time. Always do a warm-up before recording your "real" score:
Players who skip the warm-up and start recording immediately are usually 30 ms above their genuine baseline. The same Speedly logic is also published as a standalone trainer at wordlio.fun/speed.html if you want extra reps without leaving the workflow.
Speedly measures your reflex in milliseconds. Track best, average and last attempt. Three modes available.
Play Speedly →Most players see fast progress in the first week as they learn the prep routine — typically 30–50 ms off their starting average. After that, gains slow dramatically. Going from 220 ms to 200 ms might take a month of daily attempts. Going from 200 ms to 180 ms can take six months. Going below 170 ms is genuinely rare without elite hardware. Set realistic targets: knock 30 ms off your starting score in the first month, then aim to hold that floor consistently rather than chase the next single-digit improvement.
If your Speedly score creeps slower over two or three weeks despite consistent prep, check four things in order: sleep duration, screen time before bed, hydration, and screen brightness. Bright screens at night degrade sleep, which degrades reaction time, which is the actual thing you measure. Speedly is one of the best informal sleep-quality monitors available — keep playing on the Speedly page daily and your score will tell you when something in your routine has slipped.