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and yes, IC was unchecked, because i always had it set to 0 anyway.

so, for my normal rendering (ie no IC) SR3 IS slower to render a given scene.

i rolled back to SR2, rendered the scene ( with no changes) and it rendered in 20 minutes. the same scene in SR3 was only 50% completed after 5 hrs.

......

Yup. Looking like the same massive difference in render times here. Something must be causing the upset, but I've yet to test out what it is. Hopefully it is some combination of settings that SR3 doesn't like and there'll be some kind of work around.