Performance is a requirement
Most of the times as software engineers we are getting requirements that describe the functional scope of a feature. The tickets that we are working on usually look something like: _As user I want to be able to create an account by entering a name and an optional address so that I can start playing the game_. The ticket do not describe the non-functional requirements of the feature. For example, it is a completely different experience if the user is able to type her name quickly versus facing some short of lag:
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