X11vnc extremely slow in headless mode

As the topic, if I connect the computer to a monitor, the speed of vnc is fast. After turning off the monitor, the latency is unacceptable.

Or use TigerVNC over SSH - I use this - no latency - works as if monitor is connected.

Thanks for the tip

Yes, tigervnc is better than the x11vnc, it solve this problem

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