Freestyle freezing blender

I am trying to make a FREESTYLE render with cycles on my scene, but it’s taking too long…
So long that I can’t even preview it…
It’s my first time trying FREESTYLE rendering…
The raw render finishes fast, and then it starts another render that is inifitly long…
I tried removing the particle system from the carpet… but made no difference…
Anyone knows why would the outlines kill my render?

no description, specifications, image, scene file,… no comment

BTW
it’s a single threaded operation - so on a complex scene, rendering will take long
Did you test if it works at all, on a simple scene?