quickness

(noun) skillful performance or ability without difficulty. Synonyms: adeptness, adroitness, deftness, facility. Examples: "His quick adeptness was a product of good design." "He was famous for his facility as an archer."

(noun) intelligence as revealed by an ability to give correct responses without delay. Synonyms: mental quickness, quick-wittedness.

(noun) a rate that is rapid. Synonyms: celerity, rapidity, rapidness, speediness.