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The phrase "about the efficiency of" is correct and usable in written English.
It can be used when discussing or analyzing the effectiveness or productivity of a particular process, system, or method.
Example: "The report focuses on the efficiency of the new manufacturing process and its impact on production costs."
Alternatives: "regarding the effectiveness of" or "concerning the productivity of".
Exact(60)
There are grave doubts about the efficiency of this spending.
But some wildlife advocates are skeptical about the efficiency of last summer's cull.
And the emissions inventory does not capture information about the efficiency of the source.
This is all about the efficiency of the infrastructure behind the world's capital markets.
This article was amended on 18 May 2015 to clarify details about the efficiency of traditional photovoltaic panels.
The company has about 200 employees, and we started talking recently about the efficiency of its manufacturing plant.
An important debate to be had about the efficiency of the Strasbourg court should not be confused with the debate about the relationship between the court and parliament.
That's a lot of clock-turning, if you recall Adam Smith's excitement about the efficiency of an 18th-century pin factory.
For example, Indi voters were concerned about the efficiency of the train line, mobile phone coverage, broadband, mental health support and education.
Here is Peter Drucker, a twentieth-century management guru who wrote a worshipful tome about the efficiency of General Motors: "Mr. Brandeis maintained that bigness was economically inefficient.
"Even amid the political debate about the efficiency of this military operation, French people don't blame the army, instead they look negatively on the politicians' role," she said.
More suggestions(15)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com