Why does commenting out calculated member formulas in BIDs cause several minutes of CPU spike and non-responsive BIDs?

I'm using SQL Server 2012.  I have noticed that commenting out calculated member formulas in BIDs (like even just 10 lines of formula) can cause BIDs to throttle all the CPU and become unresponsive for minutes.  What could be the cause of that?

Hi Lee,
According to your description, you get high CPU usage when commenting out the calculated member formulas. Right?
With your information, we are not sure this is a MDX Query performance issue or the BIDS issue.  We suggest you optimize your MDX query and diagnose the Formula Engine performance. Please refer to the links below:
Query Performance Tuning in Microsoft Analysis Services: Part 2
Analysis Services Query Performance Top 10 Best Practices
If possible, please post some screenshots or detail information about calculated member formulas so that we can have some deep analysis.
Best Regards,
Simon Hou
Simon Hou
TechNet Community Support

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