Not sure, there might have been a fast path if you were booting to another Windo...

ack_complete 3 months ago | parent | context | favorite | on: No more boot loader: Please use the kernel instead

Not sure, there might have been a fast path if you were booting to another Windows 10 install. The old legacy Windows Boot Manager also doesn't have the issue since it's much simpler and it executes in faux text mode before the OS boots.