I am running iText in Websphere on AIX to stamp a page header on each
page of PDF files. I then serve the PDF file over http to the end
users. The stamping process runs in under 1 minute for PDF files of
less than 5000 pages (200MB). For files in the 7000 page range, even
when the file is smaller (100MB) the process goes from 1 minute to 45
minutes. I don't see any CPU or memory constraints occurring. There
may be a swap space limitation (set at 7GB) but why does it affect page
count rather than file size? I just see the file being written to the
file system very slowly. Why such a performance difference?
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