Time is important. Even in computing we have to deal with it in most applications. However, let's say that Timmy (a friend of ours) does not believe that time is of any importance and, one day, he sits down and builds a multiplayer racing game where cars move by exactly one pixel in every frame. Happy with the result on his machine, Timmy sends the program to his friend Jimmy, who has just bought the latest Super Ultra X CPU for his machine. They get into the race without any problems but, as soon as the green light hits, Jimmy rushes ahead of Timmy, leaving him behind, all dusted and confused. Later on, Timmy realizes that Jimmy's machine executes the code a lot faster than his own machine and therefore, his car was slower. Timmy never overlooked the frame time ever again

Even though the preceding story demonstrates an oversimplified example, it reveals the greatest flaw in ignoring time in any simulation—frames are executed at different speeds on different machines and thus...