I'm not seeing anything like that on my F22 desktop.
I mean while installing F22, all four CPUs on the KVM host (F21) are constantly at 100%
usage.
Running top in TTY2, while F22 is installing, I see:
Xorg using constantly CPU 60%-70%
2 anaconda processes using constantly CPU 60%-70%
I can understand anaconda, but Xorg?
Abis.