How do I make Luxrender run fast in Blender?

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I love Luxrender, I really do, if they made a body pillow with the Lux logo on it, I would fuck it so hard it would stand erect.
However, when I use it in Blender, it is slow.
The main problem is, sometimes I render out a frame and I go do something like take a shower, and I come back and find a gorgeous photorealistic scene, but the software says it is still rendering when it doesn't need to or should be. What do I do?

Pic related, pretty good looking scene but not textured yet.

Note, I have set Luxrender to render internally in Blender