Ever since developers moved to more managed development languages, such as C# and .NET in general, the need for optimization has become less important. This is not to say that optimizing your code is not important--on the contrary, it still is, and it is important to understand as a SharePoint developer that items you implement and package to your solutions will affect the overall page payload for your users. As a developer, this might not seem such a big problem, but considering the fact that your page might get hundreds or thousands of active users, the lack of optimization soon starts to take its toll.
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