Our results thus show that it is possible to significantly reduce the number of fragmentbased calculations needed to derive the embedding potential for PE-based calculations when targeting optical properties, while still also retaining very high accuracy. For some applications, namely for the calculation of excitation energies and 1PA strengths, a pure CP 3 description is of acceptable quality. On the other hand, 2PA strengths are much more sensitive to changes in the environment, and consequently, larger cutoff distances of about 10 Å are needed to reach an acceptable level of accuracy.