"Ant" wrote:

Key: HKLM\SOFTWARE\Microsoft\Dfrg\BootOptimizeFunction
Data: Enable
Value: Y (yes), N (no)

I don't have a HKLM\SOFTWARE\Microsoft\Dfrg.

Entries are needed only in the registry if they differ from accepted
defaults. Without this data item, the assumed value is Y (yes) which
means boot-time optimization is enabled. You have to create this entry
yourself if you want to change from the default (if missing) of Y to use
a value of N.

If missing, Windows assumes a value of Y.
If present, Windows uses the configured value.