Not clear question about Performance and Lifecycle

[arialdomartini]

Commenting the question

In which part of the lifecycle performance should be taken in consideration, and how?

in #6 @monklof asked

"lifecycle performance" or "performance lifecycle"?
"taken in consideration", taken into consideration for what kind of problem?
“and how”, how for what?

I replied

I try to reformulate: "In which part of the lifecycle of a program (during the design phase? after the deployment?) developers should care about performance? What should they do and when?"

We should reformulate the question and make it clearer.