“WordPress Is Slow” Usually Means You Stopped Looking Too Early

That is not a controversial statement if you understand performance. It is simply how performance analysis works.

A slow site is not slow because a label sits on top of it. A slow site is slow because work happens somewhere. The server does too much. The database does too much. PHP does too much. The browser does too much. A plugin runs too early. A theme outputs too much. A third-party script blocks rendering. A cache layer does not do what people think it does.