You obviously can use this registry key.
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectShow\ThreadPriority]
For your Watermark Removal you can follow this guide to tweak it: https://www.hows.tech/2017/03/how-to-remove-activate-windows-watermark-on-windows-10.html
One counter question here, Is Watchmax you are mentioning based on a X99 mainboard?