in reply to Out of memory and While replacements with excel XLSX application
I haven't used XLSX myself and this might be a naive suggestion but could your situation be satisfied with CSV files as your output (which you could then convert to XLSX files in Excel if you want to send XLSX to others instead of CSV)? Especially if you have huge amounts of data you can simply print to a raw text file, but you can also use very streamlined modules like Text::CSV.
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