Before revision:  As a result of  highly non-linear characteristics of chemical kinetics, a large variation in  convergence rates of  ODE integrator may occur, leading to a high load imbalance across multiprocessor configurations.
After revision:  As a result of highly non-linear characteristics of chemical kinetics, a large variation in convergence rates of the ODE integrator may occur, leading to a high load imbalance across multiprocessor configurations.