DirectX capture on your system is not working properly. This means that VNC Server is having to poll for changes to the screen, which wastes CPU resource and causes your system to run slowly. It also takes a few seconds before the screen is available to VNC Viewer users.To resolve this issue:1. Report to your video card/driver supplier that DirectX Desktop Duplication doesn't work.2. If you are happy with polling being used and want to disable this warning, set the CaptureMethod parameter to 1 (always poll). You may want to adjust the PollInterval parameter for the best trade-off between CPU usage and interactive responsiveness over VNC.Note that you may need to disconnect all VNC Viewer users before parameter changes take effect.