[pushkarev]

Basically it learns (locally, no data is sent to the cloud) how you use tabs, and tries to predict whether you will need a given tab in the nearest future. If you don't - it would unload this tab (with a few exceptions) from memory so that it won't be lost from your tabstrip, but won't consume memory and CPU resources. Think of the Great Suspender on steroids that constantly gets better over time.