I have installed Mac OS X El Capitan to a KVM/Qemu virtual machine on Gentoo. Native spice/vnc is totally unusable and slow. Native Mac OS X VNC server and linux's vncviewer is also unusable and slow, even moving windows or anything else.
I need some fast access to my local mac virtual machine, so I can feel like a native. I had some success with Nomachine NX, but now we need to use only open source software on linux side.
I tried to connect opennx with Nomachine NX server on Mac OS and failed.
Is there any other ways accessing mac desktop fastly?