Brian The Dog on 23/2/2010 at 13:00

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Just to conclusively check it is not the multi-core issue, do the following:

- Start Thief 2.
- At the game's menu screen, hit Alt-Tab to go back to Windows.
- Hit Ctrl+Alt+Del to bring up the Task Manager.
- On the "Processes" tab, right-click on the file "thief2.exe", and choose "Set Afinity" from the drop-down list.
- Make sure only 1 CPU is ticked, and click on OK.
- Exit Task Manager, and click on Thief in the Task Bar to go back to the game.
- Start a mission, and see how long you can play it for.

This is the foolproof way of setting which CPU core to use on your programs, but you would need to do it every time you run Thief 2, which is hardly ideal - hence why programs like FlipTIB have been created.

Do the following steps and let us know if it works. If this doesn't work, then it is most likely the DirectX problem which needs DDFix to sort out.