No, fast startup in UEFI differs from the one in Windows 10.
No, fast startup in UEFI differs from the one in Windows 10.
They seem to be two distinct concepts. The BIOS feature 'fast boot' lowers POST and splash screen durations.
Yes, it cuts down or speeds up the testing process. Windows lets you switch to UEFI on the next boot if pressing keys early isn't possible. The quick startup mode acts like a hybrid sleep, shutting down apps and saving their data to the disk. This might affect dual-boot setups.