Maybe poor efficiency using Geant4?

i run the same case using Mcnp6 and Geant4,
the case is from /examples/extended/biasing/B01,to calculate the neutron current spectrum from concrete top surface far from the source particle position, but no variance reduction was used,
for 3.E+09 projectiles, it cost less than 12 hours for Mcnp6, but for 1.E+5 projectiles, it cost more than 1.5 minutes for Geant4, so the calcution speed for Mcnp6 is more than 60 times of Geant4.

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