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You can be productive, but it produces a lot of bad externalities, like news websites that load 30 trackers and drain the user's phone battery.


To be fair you don’t need to know about the TCP/IP protocol to know loading 30 trackers is a bad idea.


+1 but flip side: What _do_ you need to know?


I think you should know about head-of-line blocking in HTTP1, how to fix it in HTTP/2, and maybe to test how much memory all your JavaScripting uses?


That data transfer takes time. Load less and, all else being equal, your site will be faster.


Test your apps on a device test cloud to see how they work?




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