When Is the Best Time to Start Performance Testing? - By Federico Toledo

As a fresher or new buddy in the performance testing world, there was a common question "When we can start Performance Testing?". Although I would not deny starting the first phase of PTLC i.e. requirement gathering at the initial phase of SDLC or when a beta code is ready. The answer to the above question is very well narrated by Federico Toledo in an article along with the different methodology (Agile and Waterfall). You may skip the initial part of the article if you are aware of performance testing and methodology definitions. Yes, the bottom part and the conclusion is readable.

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In Addition:

Understand PTLC (Performance Test Life Cycle) Practically