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Glass shader optimization

I managed to make a glass shader that I like, but it turned out to be a performance killer. What can I do to optimize this while remaining realistic?
A screenshot with my settings is attached.

Turn off twosided and/or change the lighting mode to surface volume.

Lit translucency is expensive and it is difficult to optimize. If you want it to be cheap you will have to build a more elaborate solution using an unlit translucent material but that will require compromises in quality.