In custom sessions running in floating window (rootless) mode on Mac and Windows, NoMachine relies on XQuartz and XWin respectively.
In case of Mac, Xquartz has to be installed on the system, see https://www.nomachine.com/AR07K00675.
On Windows, the NoMachine package ships a XWin-based component.
The implementation should be changed in order to create a native window and to handle the rendering internally.
This feature applies to all supported platforms as it will be beneficial for performance.
