I have no idea about how Doom Eternal does it, but John Carmack has some ideas on how to parallelize game engines here: https://www.youtube.com/watch?v=1PhArSuj

I have no idea about how Doom Eternal does it, but John Carmack has some ideas on how to parallelize game engines here: https://www.youtube.com/watch?v=1PhArSujR_A&feature=youtu.be&t=980 https://www.youtube.com/watch?v=1PhArSujR_A&feature=youtu.be...