the.com/responsiveness
How fast a thing answers when reality knocks on its door.
means The quality of reacting quickly and appropriately to inputs, needs, or changes — whether a person, system, or screen.
from From Latin respondere, to answer or pledge back — re- (again) plus spondere (to promise), the same root that vows in respond and response.
Web designLayouts that reshape themselves to fit any screen.
User patienceDelays past 100ms feel sluggish to humans.
Two flavorsSpeed of reply versus quality of reply.