[Libreoffice-bugs] [Bug 133603] New: FILESAVE XLSX Saving large amount of data with many character formatting is slow

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=133603

            Bug ID: 133603
           Summary: FILESAVE XLSX Saving large amount of data with many
                    character formatting is slow
           Product: LibreOffice
           Version: 7.0.0.0.alpha1+ Master
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Keywords: perf
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: libreoffice at nisz.hu
                CC: serval2412 at yahoo.fr

Created attachment 161527
  --> https://bugs.documentfoundation.org/attachment.cgi?id=161527&action=edit
Example file from Excel

Attached user made and neutralized file contains a lot of data with many
character level formatting, and nothing else (no formula, images, shapes etc.).
Saving this file to XLSX is somewhat slow, compared to Excel it takes about
twice as much time on the same machine (about 12 sec vs 5).
It would be nice to run Flamegraph on this to see if there is anything that
stands out.

Steps to reproduce:
    1. Open attached file and save as XLSX

Actual results:
Slower file save than Excel.

Expected results:
Slightly better performance.

LibreOffice details:
Version: 7.1.0.0.alpha0+ (x64)
Build ID: 75eeb423196c1e94a0189b7eccff37aed5765853
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Raster; VCL: win
Locale: hu-HU (hu_HU); UI: en-US
Calc: CL

In older versions it was a bit worse, ~17 (6.0) ~22 (5.0) secs.

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