在Sql Server Analysis Services中计算消耗的运行总计的最有效方法是什么？

I have a cube in SSAS 2005 that calculates running sums over millions of records. The current implementation is using a PeriodsToDate sum function in MDX and it is horribly slow, taking 15 minutes or more to return results in some cases. There are a huge number of solutions to this problem so I am hoping someone else has already tested a few of these out and can save me the time of implementing and testing each one.I have a cube in SSAS 2005 that calculates runn