My Computer Meets All the Requirements but Game Still Lags?

[RyRyTheGoodGuy]

My computer meets all the recommended requirements for the game, but whenever I reach over 500 prisoners, it lags and the framerate goes down, I don't get what's wrong.

Computer specs:
Graphics: AMD Radeon R7 240 2GB
CPU:FX-770K
Ram: 8GB
Storage: 1000 GB (1 TB)
Operating System: Win 10 64
Direct X: DX12

Now I know that my specs aren't the greatest, but they all are more than you need to run the game (or so I think, correct me if i'm wrong).