superefficient
adjective
su·per·ef·fi·cient
ˌsü-pər-i-ˈfi-shənt
: extremely efficient : producing desired effects with very little or no waste
a superefficient housekeeper
It developed a superefficient manufacturing method … that relentlessly roots out waste and builds in quality.—Keith Naughton et al.
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Merriam-Webster unabridged
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