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For light that comes through a window but also has blinds it seems to slow down the rendering time a significant amount. Am wondering if I should a opacity map, would this have an effect. Also regarding the new algorithm that will probably arrive after christmas, will that be much more efficient for jobs like this eg. small access for light.

Hey,

The issue is that path tracing needs to find your light, starting from the camera.
As such the chance is small to randomly pass through the blinds and then find contributing light outside.

The new bidirectional algorithm will help here, indeed, but it will only work optimally when defining light portals, which is to be implemented along with it.

A solution would be to place area-lights instead of glass, if you can get away with the different kind of lighting they produce. A textured emitter with a photo of a view outside is doable.

Radiance