The Solaris 7 MU3 installation procedure takes much less time than it takes to install the MU3 patches individually. The Solaris 7 MU3 installation time varies depending on:
CPU speed of your machine
install_mu option you select
Transfer speed of the CD-ROM drive, hard drive, or network you use to access the install_mu code and patch set
If you install the MU3 with the backout option disabled, installation will proceed more quickly. However, you will not be able to back out any of the patches MU3 delivers.
If you are performing an initial installation and want to make install_mu run slightly faster, use the -u option, which skips the validation step of install_mu. The validation step verifies that the files to be updated were not changed since the initial installation.