About Excel's "Enable multi-threaded processing" option

Excel's "multi-threaded processing" option was first introduced in Microsoft Office Excel 2007. The setting is located in Excel Options | Advanced | General. It is enabled by default but must have a capable processor to be utilized. The "Enable multi-threaded processing" setting controls multi-threaded operations other than calculation. These include multi-threaded sort, row height calculations, and finding the best fit for column widths. Additionally: this setting is not available in the Object Model for use in VBA.

http://msdn.microsoft.com/en-us/library/bb687899.aspx

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