If you still need the occasional windows world application, consider using suspend to speed up the process.
When I need a Windows application I can boot up Parallels or VMWare Fusion, press play and the virtual machine is available within about a minute or so. This is much faster than a cold boot.
When you’re done, just go to Virtual Machine | Suspend and within about 30 seconds you can quit the app and you’re done.
It’s on-demand computing, fast and convenient.