SuspendCalculations Method

This should be used when adding many formulas or modifying large amounts of data on a workbook at once so formulas are not calculated each time cells are dirtied.

For each call to SuspendCalculations, a call to ResumeCalculations must be made. As soon as the number of calls to ResumeCalculations equals the number of calls to SuspendCalculations, calculations will be resumed.

Target Platforms: Windows 8.1, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

Workbook Class
Workbook Members
ResumeCalculations Method