When we play the game They Are Billions, we get more and more infected who come in the form of hordes on different sides of our city. Initially it is easy to fight, they are only a handful. Then their numbers increase and they become a crowd, a wave, a horde, and finally an avalanche of infected, called legion.
Slowness of the game
At the end, and depending on the level, they are several thousands, even tens of thousands. It is normal for the computer to struggle. Any processor would have trouble managing as many units on a map. It becomes almost impossible to manually use your units in these conditions.
That’s why you have to think about your city and position the units with the strongest destructive potential in key places.