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The phrase "about how efficient" is correct and usable in written English.
It can be used when discussing the effectiveness or productivity of a process, system, or individual.
Example: "The report provides insights about how efficient the new workflow has been in increasing productivity."
Alternatives: "regarding the efficiency" or "concerning the effectiveness".
Exact(11)
This time eight years ago people were gushing about how efficient and businesslike the incoming Bush administration was.
For the most part, we played very well, but as always it is going to be about how efficient you are in both penalty areas and we did not quite find the right way".
I remember back in 2005 a French MP boasting privately about how efficient it was to rally French voters' support by brandishing Turkey as a scarecrow: the old European phobia of the dangerous Muslim at our door.
But that's about how efficient leaded devices were only 3 years ago.
But it spent a lot of time today talking about how efficient its next OS, iOS 12, will be on older phones like the iPhone 6.
And their PR response was to boast about how efficient they are as a company!
Similar(49)
(In that scenario, what she's doing here is implicitly asking you about Big-O and how efficient your solution is. Make sure to read up on Big-O notation).
We have to break out of the paradigm that it is all about resources – it is not about how many police officers you have, it is how you use them and how efficient the police force is.
How efficient are they?
How efficient is the boiler?
How efficient is European intelligence-gathering?
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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