For calculation times greater than 10 seconds, users become impatient and usually switch to other tasks while they wait.This can cause problems when the calculation is one of a sequence of tasks and the user loses track.
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Multithreaded calculation can substantially reduce worksheet calculation time.
However, the most important factor that influences Excel calculation speed is still the way your worksheet is designed and built.
The second time that you calculate a workbook is often significantly faster than the first time.
This occurs for several reasons: A volatile function is always recalculated at each recalculation even if it does not seem to have any changed precedents.
Slow calculation and data manipulation tasks like sorting and filtering make it more difficult for users to concentrate on the task at hand, and lack of concentration increases errors.
Excel 2007 and Excel 2010 introduce several features to help you handle this capacity increase, such as the ability to use more than one processor at a time for calculations and common data set operations like refresh, sorting, and opening workbooks.
This is because Excel does not calculate cells in a fixed order, or by row or column.
Instead, Excel dynamically determines the calculation sequence based on a list of all the formulas to calculate (the calculation chain) and the dependency information about each formula.
In earlier versions of Excel, many people created slow-calculating worksheets, and larger worksheets usually calculate more slowly than smaller ones.