Removing terrain flattening from the graph resulted in faster processing time in v8.0.0, with slightly more CPU utilization. Minutes shown:
v8.0.0: 1.5 real, 10.5 user, 3.2 sys. Peak CPU utilization ~3000%
v7.0.2: 1.7 real, 8.3 user, 3.5 sys. Peak CPU utilization ~1000%