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I just read this updated paper on MDX performance hints. The section Calculation Non Empty Behavior is very interesting because it clarified me some doubt I had using the Non Empty Behavior property for a measure.
The lesson I learnt is that it is better to specify only one measure (or one single tuple) in Non Empty Behavior, instead of a list of measures. The paper suggests that a different (optimization?) behavior is implemented in SP2 against previous versions, but I didn't found a detailed reference about applied changes. If someone has info, please let me know, thanks!
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About Marco Russo (SQLBI)
Marco Russo is a consultant, writer and trainer specialized in Business Intelligence with Microsoft technologies. He runs the SQLBI.COM website, which is dedicated to distribute resources useful for BI developers, like Integration Services components, Analysis Services models, tools, technical information and so on. Marco is certified as MCT, MCDBA, MCSD.NET, MCSA, MCSE+I.