ClosedXML / ClosedXML/ClosedXML.Report
Performance issue with double grouping
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- C#
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Description
Hi
I ran into a performance issue with double grouping. On tab1, tab2 and tab3 contain about 5000 lines
tab1 and tab3 are created using ClosedXml.Report, tab2 is created using ClosedXml, the script itself runs (used Stopwatch in the script) in 7 seconds, and do not affects performance. I checked without double grouping, with one, it works for about 2 seconds, with double grouping it is generated in 4 minutes.
[Double drouping.zip](https://github.com/ClosedXML/ClosedXML.Report/files/9054940/Double.drouping.zip)
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