Nice image! Welcome to the group!

In my opinion, focal blur isn't too slow. Fair settings (I usually go below
100 samples) is actually not slower than good anti-alias. But it's always a
good idea to speed optimise all elements of a scene. Maybe you've used CSG
"difference" to cut the holes in the floor? That can easily be very slow.
There are workarounds for it, but too difficult for me to describe right
now.

Regards,
Hugo

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