Performance vs efficiency

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!

Garnett wrote:

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.

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.