Why is the update of the registries so slow?

[PetrKryslUCSD]

Why is the update of the registries so slow?

Turning off antivirus software (not necessarily advisable), resulted in a speedup of around 3 (16 seconds compared to 46 seconds originally). I suspect there is an additional speedup that might be gained by turning off indexing (the Windows indexer is running towards the end of the instantiation).