Steam is validating game files
You’ll have to restart Steam after changing this setting.
Some older games don’t play nice with multiple CPU cores on modern computers.
In the properties window, click the Local Files tab and click the Verify Integrity of Game Cache button.In other words, there were fewer delays between switching.The CTDs I have had lately is not a memory block issue, but rather perhaps reaching the 3.1GB crash limit.One trick you can use is setting Steam.exe’s CPU affinity instead – when you launch the game through Steam, it will inherit Steam’s CPU affinity and launch with the correct CPU affinity.Right-click your taskbar and select Start Task Manager to open the task manager.
The easiest way to do this is by launching a game, alt-tabbing out, opening the task manager, right-clicking the game’s process on the Processes tab and using the Set Affinity option.