In computers with two or more processors, users should see a slight increase in simulation speed because chart updating occurs on a separate thread. Typically, Extreme Speed is faster than Normal Speed, even with multiple processors. In Normal Speed, when a seed value is set and multiple processors are used with a model that has embedded Crystal Ball distribution functions (CB.Normal, and so on) in the Microsoft Excel spreadsheet, results may not be exactly the same between simulations. However the results are valid. This is because Microsoft Excel does not guarantee execution order in this case. This can be corrected by running in Extreme Speed or Normal Speed with a single thread.