The rate at which screen changes occur under Microsoft Windows can vary dramatically, especially when the display is controlled by the CGA, depending upon how the Microsoft Windows Update Video function is used. Each call to the Update function takes an appreciable amount of time; thus if many calls to this function are made while updating a single screen, performance will suffer.
We have tried to minimize the number of Update Video calls made by Vermont Views functions, consistent with the need to insure that the screen is updated at the end of each function call.
The screen updating algorithms used within Vermont Views may degrade performance under Microsoft Windows when repeated calls to character or string output functions are made to perform a single screen update. In this case, it may be desirable to disable the automatic screen-updating capability of the functions at the beginning of the procedure and to explicitly call the Update Video function at the end of the procedure.
