Hi,
I honestly don't know what the numbers you've circled mean...
It's a pretty large map you have there with a lot of spawners. When you disable peaceful mode, all biters are killed, and I'd assume all newly spawning (hostile) biters are then suddenly realizing there's pollution to be annoyed by. My first guess would be to wipe out some (a lot of) nests.
It could also be that the mod is still looping through the spawned biters to kill / toggle them. Considering the size of the map, that might possibly take a while.