To what extent knowledge of optimizing content assets (in order to achieve high-performance) should be the concern of designated developers on a team vs being a general topic that every developer on the team should be knowledgeable about?
I am a real big fan of everyone focusing on performance.
One on the top ways to improve customer retention and sales is to improve performance - so having budgets and goals for your site/apps speed is really important - and the whole team should be focused on that - and weigh the pros and cons of adding new features when they slow everything down.
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