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In Windows 10 ,
How to change photo screen saver slide show speed from registery or through commandline in Windows 10 to "slow" speed ?
You can easily find out those values yourself using Sysinternals process Monitor. In the end you will see these values:
Key : HKCU\Software\Microsoft\Windows Photo Viewer\Slideshow\Screensaver
Value : Speed (DWORD)
Values: 0-2 (slow-fast)
Required, but never shown