The noise does not go away for very long

[art-MIXER]

Help me understand what my problem is, constantly had to overcome any difficulties with the renderer. Please portals gave some strange stains on the walls, and the method of exclusion revealed rid of it. Like everything was rendered without any spots, but the noise does not go away for very long, just long catastrophically. Help to find and solve the problem:

[maru]

I suspect "light samples multiplier" 16 may be causing some troubles. Set it to 1 or 2 and try again.
How do you make your portals? It's best to create a single face capping the window hole. Also read this:
http://corona-renderer.com/wiki/performance_debugging

[Ludvik Koutny]

My bet would be curtain material :)

[art-MIXER]

I suspect "light samples multiplier" 16 may be causing some troubles. Set it to 1 or 2 and try again.
How do you make your portals? It's best to create a single face capping the window hole. Also read this:
http://corona-renderer.com/wiki/performance_debugging

I used to have stood value LSM 2 and was still, to 16 this was my desperate attempt )
Portals I did, as recommended in the specification of the Corona, one polygon in the window, they are well helped illuminate the room, but were given strange artifacts on the walls. I removed them and the problem is gone, but it is much darker than what I compensated by exposure. And now these problems with a long clearance from the noise

[art-MIXER]

My bet would be curtain material :)

I hid them, nothing has improved, except that more light hit the room.

Maybe Forest Pack Pro as brakes? There 10 different villi, each of 10K polygons

Stats, maybe it's something to say: