quicknesses

Rapid reaction times

Quicknesses is the plural noun of quickness, which is the noun related to the adjective quick.

speeds

velocity

Directed rate of motion

celerity · acceleration · pace · tempo · briskness · hastiness · speediness · promptness · expeditiousness · alacrity

reflexes

reaction time

Speed of response

instincts · readiness · snap · twitch · anticipation · coordination · timing · perception · agility · sharpness

Opposites
speed/velocity

quicknessestardiness

State of being late

pokiness · leisureliness · lethargy · deliberateness · unhurriedness

mental/cognitive speed

quicknessesdullnesses

States of being uninteresting

slow-wittedness · dullness · obtuseness · dimness · denseness

responsiveness/reaction time

quicknessesunresponsiveness

Lack of reaction

sluggishness · inertness · torpidity · listlessness · languor

Phrases
Family

quickness

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G