I have also performed tests with similar results, before seeing this post; HXXF is about 10 times slower than HSSF. For example saving the file using org.apache.poi.ss.usermodel.Workbook.write(OutputStream stream) is also 10 times slower if using HXXF. Is this something we have to live with for now? All our code is written using org.apache.poi.ss.usermodel to be able to support both .xls and .xlsx. I have seen comments that HXXF is expected to be 2 to 3 times slower than HSSF and I would be OK with that. Have someone managed to confirm this with real tests? Cheers Johan
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