BPC 7.5 AfterRange Causes Extreme Performance Issue

In a report when I apply second AfterRange the run time goes from under 2 minutes to 15 minutes. I know there are performance penalties for using Before/AfterRange but I have never seen the discrepancy to this proportion.
Report contains 1 Column (Time) and 4 Rows in Expansion. The first range which causes no issues for Cost Centers is defined Q73:V74, the range which causes the performance issue and applies for each Employee is defined as Q71:V72
To test this I have two versions of essentially the same report, one with only Cost Center AfterRange and this version runs in less than 2 minutes, then I have the other version in which I have added one more AfterRange to another column and that's when the hell breaks loose and this version of the report runs in 15 minutes. The number of records is roughly 2000, and I realize that the range causing the issue is applied on pretty much every rcord in result set but still I'd not expect the run time to increase by this much.
BPC Experts, ideas on what could be causing this issue, any help would be highly appreciated. thanks!

Hi
1> Please try to restart your Gernal Server
2> Check after optimization that helps
Regards
Vinoo

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