If you disable the boot time splash screen, it will have no effect on your boot time, but in the very rare event that a boot time message is displayed, it will enable you to see it.
To disable the boot time splash screen:
1. Open a CMD prompt and type attrib -r -s -h c:\boot.ini.
2. Use Notepad to open C:\Boot.ini.
3. Replace the /fastdetect string(s) with /fastdetect /noguiboot.
4. Save the changes and exit Notepad.
5. Open a CMD prompt and type attrib +r +s +h c:\boot.ini.