Both XB1 and PS4 have 8 cores (2xJaguar modules). Both also reserve one of the core exclusively for the system, so a single-threaded game would only leverage 14% of available CPU compute power.

The Switch is somewhat similar through to a lower extent: it effectively uses a quad-core ARM, with one of the core reserved to the system leaving 3 to game developers.

For the last decade most of them are console ports, consoles have many CPU cores since Xbox 360 (3 cores / 6 threads, 2005) and PS3 (1+6 asymmetric cores, 2006).

Most games render from single thread, but besides submitting these draw calls games do a lot of things under the hood.

Can't keep 150 FPS at all times during a replay for instance, gonna disable mitigations and see if anything changes.

EDIT: nothing drastic happened, probably need to disable Windows protections as well.