why changing CPU affinity for some games by removing core 0 fixes the performance issues

Question

I’ve seen couple of games like stalker, elder ring or fallout 4 perform better when you remove 1 core from the game’s executable. But why?

In: Technology

Answer 1

Most Windows processes (desktop, browsers, messaging services, email, etc) tend to run on Core 0 (the first CPU core).

By telling your game not to use Core 0 forces it to use another Core (or other multiple Cores) which aren’t bogged down those processes.