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Does anyone know if Google uses GA data (in particular bounce rates, time-on-site, etc.) as signals in rankings? I've always wondered if the additional data gathered once a user clicks through from the SERP to the site was eventually factored in to the site's ranking. (For example, a faster site receiving better rankings.)

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Google has a separate tracking mechanism with regards to bounce/back to SERP rates which does not require GA at all. Time on site could theoretically be implied.

It has also been (somewhat officially) stated that GA data is not used for ranking purposes, but make of that what you will.

Since they also render pages themselves, they don't really need client page load metrics to evaluate rendering performance.

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