A typical adult's visual reaction time is around 200–300ms. Under 250ms is considered fast, and professional gamers often score in the low 200s.

It measures the time from perceiving a visual cue to responding with your hand. It's a measure of pure neural response speed — it doesn't represent overall gaming skill, but it can improve somewhat with practice.

Clicking before the screen turns green is treated as an anticipatory click rather than a genuine reaction, so it's filtered out as 'too soon'.