Just because you don't believe doesn't make it not true.. Realtime on linux works very very well. I would go as far to say it works perfectly.
I have tested and loaded down a ton of linux/linuxcnc systems. No issues. I do use a few windows programs still - acad 12 and I have been dabbling in fusion... I run both in virtual machines. I have a XP vm and a 10 vm.
Both vm's running while linuxcnc was running. again - amazing.
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Lots running...