> it's maybe not noticeable in a typical install, 

I have Core i7-2640M CPU @ 2.80GHz with 4 cores (2 physical + hyperthreading). 
If I run netinst in KVM with 2 virtual CPUs attached (I assign 2 cores instead 
of 1 to speed up the installation), my host performance is *devastated*. I can 
hardly scroll a web page in Firefox. Opening any application takes 5-10 
seconds. The longer the installation runs, the worse it gets. If I use Live 
instead of netinst, everything is smooth and fast. If I disable the spinner 
animation using that updates.img, it's again smooth.

This problem didn't exist in F20 and prior. It appeared in F21.

I wanted to perform some measurements to have exact numbers (e.g. the length of 
an installation with and without the spinner, depending on the number of CPU 
cores assigned; gather some `top` statistics during the run) before reporting 
the bug, but I never got to it. Any help is welcome.
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