You should separate the Spreadsheet::ParseExceland Spreadsheet::WriteExcel code to see which one is causing the problem. There are a couple of things to look out for.

Spreadsheet::ParseExcel reads entire Excel files into memory and then into Perl data structures. For large files this can be slow. Run Spreadsheet::ParseExcel against filesizes of 0.5MB, 1MB, 5MB and 10MB and you'll see the effect.

Spreadsheet::WriteExcel may run slowly if it cannot create temporary files. On most OSes this doesn't happen (IIS on Windows is a known exception). See the set_tempdir() section of the documentation for information on how to detect this problem and resolve it.

See also Out of memory using Spreadsheet::ParseExcel and the Spreadsheet::ParseExcel_XLHTML module which should be quicker than Spreadsheet::ParseExcel although with fewer features.

--
John.

In reply to Re: Slow Code by jmcnamara
in thread Slow Code, Spreadsheet::ParseExcel, and Spreadsheet::WriteExcel by Idris

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