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refraction with reflection

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Ive noticed that when I am adding two pbrspecular vops together, one for reflection the other for refraction I am getting rendertimes that are 4 times longer than rendering without reflection.

Ive set up the reflection limit to 1, refraction is on 5. 

Reflection rays getting trapped in refraction, I guess.


I am aware of refraction being expensive, but how do you cope with refracting objects?

Edited by sekow

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yeah, you're probably tracing to the far side of your object which also traces a reflection back into the object which then refracts some more.  not sure why it's 4 times and not just double... you can play with your reflection/refraction scoping to eliminate things to help speed stuff up.

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