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Windows 11 system fast startup has failed
The Fast Startup option is enabled in Windows 11 Pro, but boot speed shows no improvement. Attempts to modify settings via commands, adjust Group Policy, and delete hibernation files have all proven ...
The key thing to understand is that Fast Startup is not a traditional "boot." It's a partial hibernation. When you shut down with Fast Startup enabled:
The user session is fully closed (all apps log off).
The Windows kernel, drivers, and system state are saved to the hibernation file (hiberfil.sys).
The computer powers off.
On a "boot," Windows reloads the kernel and driver state from hiberfil.sys instead of reinitializing everything from scratch. If anything goes wrong during the save or load process, Windows will silently perform a full cold boot for stability reasons, making it seem like Fast Startup did nothing.