Windows 8 has a new bootloader with a graphic interface and troubleshooting options. However, it's harder now to quickly get to advanced options or load a different OS. Boot UI Tuner solves this problem, allowing you to configure your boot options and tweak the bootloader.
This free portable utility enables you to very quickly and easily tweak Windows 8's boot screen and options at startup. Just check off the options you want and the changes will take effect when you restart.
You can also disable the Windows logo, loading circle and messages, which could potentially speed up your start time.