in reply to Spreadsheet::WriteExcel large files

I think Spreadsheet::WriteExcel does not use any compression on the data it writes to the Excel-file but opening and saving the Excel file with the Excel application compresses the data.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

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