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DateTime Performance Issue

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There seems to be some form of performance issue related to DateTime data types.

I can generate very large spreadsheets of say 100 rows and 8 string or integer columns is less than one second.

If I try the exact same code with DateTime columns the time increases to 2m 30 seconds!

I really hope you can spare the time to look at this as it’s potentially a very fast lightweight library.

Thanks

Nick

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