It looks like Google Analytics is rolling out a new User Timings section to the existing Content -> Site Speed reports, as +Andrea Pernici reports below.

I also see it, but the referenced trackTiming configuration setting appears to be currently undocumented... perhaps +John Mueller can alert the right people? I don't yet see a Google Analytics Blog post on the topic, but can imagine it is on the way.
Ho visto apparire in analytics User Timings in Site Speed per la prima volta oggi.

Qui si parla di trackTiming.

Ne sapete qualcosa +Sean Carlos +Marco Cilia ?
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