I would check the boot variables below from the LOADER prompt:
LOADER> printenv boot_verbose -> Should be ***undefined***
LOADER> printenv bootarg.init.console_muted -> Should be "true"
LOADER> printenv bootarg.init.verbose- > Should be ***undefined***
If the bootarg.init.console_muted variable is set to "false" it will definitely add a lot more output to the boot.