The MSIFASTINSTALL property can be used to reduce the time required to install a large Windows Installer package. The property can be set on the command line or in the Property table to configure operations that the user or developer determines are non-essential for the installation.
The value of the MSIFASTINSTALL property can be a combination of the following values.
Windows Installer 4.5 or earlier: Not supported. This property is available beginning with Windows Installer 5.0.
Build date: 11/12/2009