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Speeding up Autodesk Maya's Vector Renderer

I have a scene composed mainly of NURBs, which I want to render in the Vector renderer strictly for the look it gives me--not the vector it delivers. I first convert the NURBs to a very low-res polygon mesh (by control point), which gives me a very light scene. However, my renders are taking a really, really long time (like 5 minutes for a 100x100) while they are seconds in mental ray and maya software.

Are there any tips to speeding this up? Is it my lighting? I have two directional lights and a camera point light. I just want a quick and snappy render.

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