cfdemSolverIB - computational Effort

Hallo everyone,

I just started to use the cfdemSolverIB and I'm interested in the comparison between cfdemSolverPiso and cfdemSolverIB regarding the computational effort? When I apply the momentum exchange model ShirgaonkarIB, the computational time increases dramatically. Why is the momentum exchange as slow compared to e.g. KochHilldrag?

Thanks.