lougro Other companies such as Amulet Hotkey also acknowledge that dithering is used on MacOS. They have tools available to remove it but you need to be using their hardware (which is typically in the several thousands of dollars).
Temporal dithering is a technique graphics cards use to generate intermediate colors, by rapidly alternating a
pixel between two adjacent color values. The effect is not perceptible to the human eye. For any compression
algorithm, such as that used by PCoIP, this results in a significant overhead when dealing with the increased
pixel color activity.
Enabling temporal dithering on a machine using PCoIP can result in high bandwidth usage and poor
performance, even when the display is seemingly static. To resolve this, you must disable temporal dithering
on the computer where the PCoIP host card is used.
Temporal dithering is enabled by default on Apple Macs, with no user-visible option to disable it.
To disable temporal dithering, you must install an appropriate macOS Kernel Extension (‘kext’). The kext
disables temporal dithering on the local graphics card by changing internal driver settings