Population evolve to recycle the food which is rare in the environment. Rapid increase of population appears at timestep 70 when agents thanks to mutation change their food genome from preset one to more efficient in given environment. Without mutation population growth is only due to best individuals selection and their spread by reproduction. But variance is limited only to initial population, no new agent can evolve. Other non zero mutations don't differ much in effect, the selection pressure is high enough to choose only good mutations and resist to disadvantageous mutation cases.
Mutation rates are enourmously high comparing to nature.
This is due to speeding evolutionary adaptation. The same happens with E eaters group, C eaters, B eaters. It would be very valuable for me if you shared your opinion or any feedback.