Displacement mapped mesh taking longer than high poly original mesh to render?

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Hi everyone,

Got 1:1 representation of my 2 mil poly mesh onto an 8k poly mesh. Unfortunately when I add SSS (set to 0.6) to both models the 8k with displacement takes 90 seconds to render while the original mesh takes 60 seconds to render.

Is there something I'm missing or do displacement maps cause a performance hit in Mantra?
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Of course, and much more so if ‘add bump to raytraced displacement’ is enabled.
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Ah yeah…removing ‘add bump to raytraced displacement’ reduces the render time but also reduces some of the quality…

Hrm…any way around this or any other adjustments I can make? 30 seconds extra per frame is a hell of a time hit to take, especially over the course of an animation.
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