I'm having the same issue here. With a stopwatch in hand, it seems like the game takes near exactly 20 seconds to launch on a clean fresh Windows 11 instance, while on Windows 10 it took 3s. It doesn't seem to be storage related, as the game takes the exact same time to start on a fast NVMe SSD and on a mechanical hard drive.
I've tried many things.
- Clean boot (all startup items disabled, all non-MS services disabled)
- Updated drivers for everything
- Latest BIOS, SSD firmware
- Windows 11 fully updated
- Toggling game mode on or off
- Disabling core isolation
To no avail.