STEP 1: First start DCS in VR. Select All Processes in Process lasso: Set affinity, Always, and select the last or first 4 threads of your if you have an 8 core/16 thread or more CPU.
For step 1 do you mean to set all other processes( there can be hundreds of them) or just DCS . Step 1 can be miss leading. you did not elaborate on this. Is this select DCS and set affinity or set affinity for all other processes (background processes)? this is confusing.