Closed-loop performance for each N_p level showing the average residual rms WFE over all 100 randomly generated aberrations vs loop iteration. The error bars give the standard deviation of the average residual rms WFE at each loop iteration across the set of 100 random aberrations. As expected, as N_p increases, the average residual rms WFE, as well as the stand deviation from the mean, decreases. For values of N_p between 10⁸ and 10⁶, the rms WFE converges to ≤1 nm.