https://bz.apache.org/bugzilla/show_bug.cgi?id=62328

--- Comment #4 from Greg Woolsey <[email protected]> ---
Interesting.  I've found significant differences in memory and performance when
switching from reading XLSX from a stream vs. from a temp file, where temp file
access is much faster and leaner.  That may be something worth trying for you. 
The reason is because file access can use ZipFile and only access the zip
contents needed by your code, leaving the rest on disk until you write it all
out, at which point it doesn't necessarily have to parse the previously
unreferenced/unread bits, just copy them over, which is what you want.

Beyond that, if you want to work up a patch with tests we'd be glad to take a
look.

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