Im a developer, and ive written a thread scheduler for an os, i know what threads are :‘)
The game has 47 threads, which you can verify in task manager. What you are thinking of is how many threads the cpu can process in parallel, which is indeed 4 on my cpu and nowhere before was it said you were talking about cpu “cores” ( or cpu threads like you call them )
However, like i said, the game runs perfectly on my system and my friends’ so the engine and windows seem to balance the priority and timings of those 47 threads just nicely here, even past act 2, and i dont see why it would need to use more cpu cores to process… Nothing. Adding more threads and using more cpu cores does not always mean faster processing of data…