“How fast is a website?” While it’s a simple question on the surface, it can be challenging to answer. In the past, the answer would be based on the load time of a page, but over the years, we have evolved our approach to site speed to incorporate new metrics, alone or in combination with existing metrics. To build fast sites and stay competitive, it is critical for people passionate about performance to stay informed about new metrics and the methodology behind them. Today, when asking “how fast,” we need to look at more than load sp...

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