Speeding up Flow runs? - Forum - Delft3D Flexible Mesh

I've got a FLOW model from a hydrology team that I'm working with. The machine here is roughly equivalent to theirs in terms of power. However, the hydrology team's machine runs their FLOW simulation in about 16 hours, and mine says it'll take 6 days.

We're both running Windows (they're using Win7 Pro, I've got Win10). MPICH is installed on both, I've got 32gb RAM (16gb more than theirs), we're both using i7's (mine is slightly older than theirs), and I've got the model input & output and Delft3d installed on a SATA3 SSD (theirs is on a normal HDD).

I'm leaving out some technical details for the sake of brevity, obviously. I'm mostly hoping for a troubleshooting guide at this point. Can anyone offer some advice on where I can look to speed my FLOW runs up?

Thanks!
-Chris