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.
Keith Naughton et al. superefficiency
ˌsü-pər-i-ˈfi-shən-sē
noun modern appliances designed for superefficiency
Word History
First Known Use
1857, in the meaning defined above
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