I use Blender mainly for creating architectural renders. I love Cycles, it's nodes, quality, realism, everything about it, except for it's speed and noise.
An indoor night-time scene with a lot of small light-sources seemed almost impossible, somehow I've managed to do it but I had to pull all kinds of node-tricks to get a relative low-noise render and still lasted 5 hours per image (1800x1200) on a mid-high range GPU to get acceptable results.
Is there an alternative render engine for arch-viz? It doesn't have to be completely free, but has to work on GPU, should be well-integrated into Blender, node-based engines are preferred. Cycles would be perfect without the noise.
Thanks for any input, and sorry for asking but I have no time to try all the existing external renderers, since there are so many of them now.