There’s no shortage of performance advice, is there? The elephant in the room is the fact that it’s challenging to interpret: Everything comes with caveats and disclaimers, and sometimes one piece of advice can seem to actively contradict another. Phrases like “The DOM is slow” or “Always use CSS animations” make for great headlines, but the truth is often far more nuanced.
Take something like loading time, the most common performance topic by far. The problem with loading time is that some people measure Speed Index, others go after first paint, and still others use
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Source: Smashing Magazine