[Libreoffice-bugs] [Bug 121094] New: Performance: Opening xlxs with many rows takes several minutes

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=121094

            Bug ID: 121094
           Summary: Performance: Opening xlxs with many rows takes several
                    minutes
           Product: LibreOffice
           Version: 6.2.0.0.alpha1+ Master
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Keywords: perf
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: kelemeng at ubuntu.com

Created attachment 146224
  --> https://bugs.documentfoundation.org/attachment.cgi?id=146224&action=edit
Example file from Excel with 800k rows

Attached user-made xlsx has a few rows with actual data then 800k empty rows
that are actually saved. I have no idea how or why they made it so.

Opening this in Excel takes a few seconds, but in Calc it takes several minutes
with 100% processor use. Memory use jumps inside a range of a few megabytes, so
it does not run away.

It would be nice to improve performance in case of such "extreme" files.

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