FYI,

Microsoft is apparently planning to introduce a new power saving
mechanism, dubbed "Power Throttling", which may - or may not - have an
effect on POV-Ray render performance when running POV-Ray on certain
hardware.

The mechanism is currently implemented in the Windows 10 Insider builds
16176 and 16179, and will presumably be released in September/October as
part of the Windows 10 update codenamed "Redstone 3".

[Source: "c't Magazin für Computer Technik" issue 10/2017, Heise Medien
GmbH & Co. KG]

Please refer to Microsoft or 3rd party information for details on the
matter.

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