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Hi,

In my dictionary, people say:

performance: how well or badly you do sth, how well or badly sth works.

efficiency: how well or badly you do sth, how well or badly sth works.

So, how can I distinguis them? Are they interchangeable? If not, what is the difference in meaning between them?

Quoc
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Comments  (Page 2) 
Thanks,

1/ You wrote:

In general terms, a “good performance” is an act or work well done by a person or entity. It has little bearing with the word “efficiency”.

What is that little bearing ?

2/ You wrote:

In business terms, if a company or investment portfolio yields better profit or a bigger bottom line than predicted, it’s said to have “excellent performance”. The company may or may not be “efficient”.

What is the meaning of "efficient" in this case?

3/ You wrote:

In terms of automobiles, they almost mean something entirely opposite.

We most likely won’t find the word “efficient” in the description of a high-performance car such as Porche. Performance – means cornering, speed and agility.

However, the word “performance” is unlikely to be found on the advertisement of a Prius. On the other hand, “fuel efficiency” is splattered everywhere.

I know Porche and Prius are the names of cars. I still don't understand the difference in meaning between performance and efficiency in terms of automobiles. As you said, Performance – means cornering, speed and agility. So, what is the meaning of efficiency in terms of automobiles?

What are the meaning of cornering and splatter ?

4/ You wrote:

If the mentioned performance is evaluated or judged by the efficiency of it’s components, then a relationship may be formed.

In this case, what is the exact meaning of performance and efficiency?

Quoc
In general terms, a “good performance” is an act or work well done by a person or entity. It has little bearing with the word “efficiency”.

It has little bearing with the word “efficiency”. - It means having little to do with ....

2/ You wrote:

In business terms, if a company or investment portfolio yields better profit or a bigger bottom line than predicted, it’s said to have “excellent performance”. The company may or may not be “efficient”.

What is the meaning of "efficient" in this case? - It means the company may or may not utilize the resources efficiently,

In terms of automobiles, they almost mean something entirely opposite.

We most likely won’t find the word “efficient” in the description of a high-performance car such as Porche. Performance – means cornering, speed and agility.

However, the word “performance” is unlikely to be found on the advertisement of a Prius. On the other hand, “fuel efficiency” is splattered everywhere.

Porche is known for it's ability to take curves and corners, and it's speed which in automobile terms are chararters of performance.

Prius is known for the fuel efficiency but not for the same chararters of the Porche.

I know Porche and Prius are the names of cars. I still don't understand the difference in meaning between performance and efficiency in terms of automobiles. As you said, Performance – means cornering, speed and agility. So, what is the meaning of efficiency in terms of automobiles?

What are the meaning of cornering and splatter ?- You need to do some work and look them up in dictionary. If you have more questions, we can discuss it.

4/ You wrote:

If the mentioned performance is evaluated or judged by the efficiency of it’s components, then a relationship may be formed.

In this case, what is the exact meaning of performance and efficiency? -What this meant was[efficiency] can be a component in the classification of [performance] when applied in the proper context.

Hope this helps!Emotion: smile
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Goodman, I see what you're saying but still maintain what I said about the different usages was valid.

Can I just point out "Porsche" has an "s".

"It's" is short for "it is" or "it has". "Its" is a possessive pronoun.
GarnettGoodman, I see what you're saying but still maintain what I said about the different usages was valid.

Can I just point out "Porsche" has an "s".

"It's" is short for "it is" or "it has". "Its" is a possessive pronoun.

Garnett,

I don't own a "Porsche" and yes, I missed spell it.

I am fully aware the difference between "it's" and "its". Of course, you are entitled to your opinions.

Efficiency in a car for instance would be how many miles the car can run using a litre of fuel. Performance on the other hand would be how fast the car can run, how fast it can accelerate, its swerve or its drift. This corresponds to the description of efficiency as a comparison of input with output. Efficiency tells us how well a system/device/organization uses resources, while performance tells us how well he does a job without considering the resources expended.

Take another instance where you examine two students. You can say one student performs better than another because he/she scores an A while the other scores a B student. However, the B student may have access to significantly less financial and academic resources, this is not considered in evaluating the performance of the student. But if we were to evaluate the efficiency of the B student, we may discover that the B student used his/her resources more efficiently.

Another instance is a refridgerator. The performance of a refridgerator is how fast it can get to its rated low temperature and how well it maintains that temperature. The efficiency however is how much energy it consumes to get to that temperature. So the efficiency is how well it has used the energy input to cool down while the performance is how well it cools down.

PS: Performance and efficiency as used by engineers are slightly different concepts from these

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