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efficiency has no recorded synonym. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is inefficiency.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the ratio of the output to the input of any system
skillfulness in avoiding wasted time and effort
“she did the work with great efficiency”
Synonyms, antonyms and the broader and narrower relations for efficiency come from Princeton University’s WordNet. Full sources and licences.