Note: Tested only with CoJ - Gunslinger

Didn't see a topic about this yet. It would appear this game fails to handle a system environment with more than 6 or so CPU threads available. Begins loading in the background but never starts. Had the same problem, but forcing the EXE to only run on CPU 0 and 1 appears to do the trick. Since there's no way to permanently set CPU Core Affinity in the task manager, I made myself a shortcut:

%ComSpec% /c start "" /high /affinity 3 "path to the EXE"

You may also have to run the EXE as an administrator. Hope this helps!

I used Process Lasso and set the affinity to 1-9 cores.
The first COJ needs the CPUs to be restricted using MSConfig. 1-4 seems to give the best performance.

CoJ - Gunslinger

I found another way to run this game on Intel CPU (14gen) with Win 11.
First option: set up affinity trough Win Task Manager.

I set the affinity for process GOG Galaxy:
1. install game from GOG Client
2. Ctrl+Alt+Del -> Task Manager->Details
3. search for 'gog' and right click on GalaxyClient.exe -> Set affinity
4. i have tried to select only 8 CPUs, but the game will run also on 30 CPU (but not on 31 CPU).
5. run the game from GOG Galaxy client.

Problem with this solution is, that it will reset the affinity settings, if you turn off your computer.

Second option: set up affinity on GOG Galaxy client app (via shortcut).

1. find you GOG client shortcut location in file manager (i used the ona the GOG created in my Win->Start menu )
2. right clic on shortcut and select properties
3. in 'Target' line put the following command:
%ComSpec% /c start /normal /affinity 7FFFFFFF GalaxyClient.exe
normal -> mean process priority (can be High/AboveNormal/Normal/BelowNormal/Low )
affinity 7FFFFFFF -> means 30 CPU in this case ( or use combinations below )
1 ---- 3
2 ---- 7
3 ---- F
4 ---- 1F
5 ---- 3F
6 ---- 7F
7 ---- FF
8 ---- 1FF
9 ---- 3FF
10 --- 7FF
11 --- FFF
12 --- 1FFF
13 --- 3FFF
14 --- 7FFF
15 --- FFFF

This way, the affinity will be set from moment you launch the gog client. and you dont need to
set it manually each time you start your computer.

I dint test the number of Cores used for performance.
Hope this helps!