The cost of the E-sumFTFC approach can be reduced by using an average FC lineshape function generated using a small number of snapshots and aligning the lineshape with the VEE/VDEs obtained from the optimized geometries of the chromophore in the frozen solvent. The use of an average FC lineshape is valid if the perturbation introduced by the different local frozen solvent environments present in each snapshot does not significantly alter the shape or displacement of the ground and excitedstate potential energy surfaces of the chromophore. The average FTFC lineshape, σ avgFTFC , is derived by aligning the absorption or emission 0-0 energies, ω 00 , of individual FTFC spectra. We then scale the area of the lineshape for each snapshot according to the square of the transition dipole computed for the optimized geometry.