The distributions of damping timescales and variability amplitudes for radio-quiet AGNs with efficient and inefficient accretion are presented. Top panels: distribution of variability amplitude (SF_∞; left) and its cumulative distribution (right). Bottom panels: corresponding distributions for the characteristic timescale of variability. The red solid line represents radio-quiet AGNs with efficient accretion, while the blue dashed line denotes radio-quiet AGNs with inefficient accretion.