The resulting wall clock timings for 1 and 2 compute nodes are shown in Figure , where we show that as we increase the number of atoms in the solvent region, the computational time increases linearly, at least up to system sizes of 136 atoms in total. Figure further decomposes the average time spent by TeraChem to compute each of the gradient and NAC vectors for the largest 20 solvent molecule-fulvene system, with the wall timings highlighted in purple in Figure . When two nodes are used, all gradient and NAC "job times" do not sum to the "wall time" as indicated by the green line in Figure ; the wall time measures the real-world time as seen by the user while all of the TeraChem jobs are simultaneously running, whereas the job time is the cumulative time measured by the individual nodes themselves.