Long story: I noticed my brand new 16' MacBook Pro started acting sluggishly doing even trivial things like scrolling. Deleting Chrome and Keystone made my computer way, way faster, all the time. Short story: Google Chrome installs an updater called Keystone on your computer, which is bizarrely correlated to massive unexplained CPU usage in WindowServer (a system process), and made my whole computer slow even when Chrome wasn't running.
