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  • Original Author: null45
SC4CPUOptions DLL Pl SC4CPUOptions DLL Plugin

A DLL Plugin for SimCity 4 that configures the CPU core count and priority.

This plugin combines the functionality of the SingleCPU and CPUPriority plugins in a single DLL, and adds the ability to set the CPU priority without using a command line argument.

If the -CPUCount and/or -CPUPriority command line arguments are present, those values will be used in place of the plugin's default options. When those command line arguments are not present, the plugin will configure SC4 to use 1 CPU core and the CPU priority specified in the configuration file.

This plugin is incompatible with 3rd-party launchers that set a CPU priority, it will override the CPU priority setting they set when starting the game.

System Requirements

  • Windows 10 or later

The plugin may work on Windows 7 or later with the Microsoft Visual C++ 2022 x86 Redistribute installed, but I do not have the ability to test that.


  1. Close SimCity 4.
  2. Remove SC4SingleCPU.dll and SC4CPUPriority.dll from the Plugins folder in the SimCity 4 installation directory, if present.
  3. Copy SC4CPUOptions.dll and SC4CPUOptions.ini into the Plugins folder in the SimCity 4 installation directory.
  4. Configure the plugin settings, see the Configuring the plugin section.

Configuring the Plugin

  1. Open SC4CPUOptions.ini in a text editor (e.g. Notepad). Note that depending on the permissions of your SimCity 4 installation directory you may need to start the text editor with administrator permissions to be able to save the file.

  2. Adjust the settings in the [CPUOptions] section to your preferences.

  3. Save the file and start the game.

Settings Overview

Priority is the CPU priority that the game will use, the default is AboveNormal. The supported values are listed in the following table:

Priority Value      Notes
Normal     The default value for a process, unless the parent process has a different value.
Low     An alias for Idle.


The plugin should write a SC4CPUOptions.log file in the same folder as the plugin.
The log contains status information for the most recent run of the plugin.

Source Code and Support

Plugin thread:

The plugin's source code and issue tracker are located on GitHub:

Created 2024-03-22T03:41:17-07:00
Changed 2024-03-22T03:41:54-07:00
Version 1.0.1
Size 0
Created by SC4E Staff
Changed by Daniel (SA)
Downloads 48