Yeah, with 'many wilderness POIs' map generation takes around 15 seconds longer for me.
I've tried 5 different seeds with 'many towns' / 'few POIs' / 'all biomes same size' now and in every seed the forest biome only has a few small towns while all other biomes have huuuge cities. Not sure if that's a bug or intentional.
I prefer to have at least one town with T4/T5 building in the forest biome.