SIince your question is SSAS specific you can ask your question on SQL Server Analysis Services forum.
Mangal Pardeshi. You can turn off the SUN, but I'm still gonna shine. ;)
- Proposed as answer by Mangal Pardeshi Saturday, December 27, 2008 4:02 AM
This would be rather hard to address specific cause but i suppose that you have properly done partitions and aggregations and
Other optimization technique to your cube.
Also, Is this full processing mode or Incremental processing option.
Those are thoughts comes in mind right now.
Dibyant S U padhyay