Newest Industry

In writing the last post, I was thinking about what factors go into making the Web performance of a site "excellent". What defines in the minds of the sites users/customers/visitors/critics/competitors that the performance of a Web site is excellent?
These are usually judged by the standard factors:

Usability
Responsiveness
Availability
Traffic
Reliability
Security
Clarity

But within the company itself, how is the performance of [...]