Oops, I comment #20 should say that I tested with LibreOffice 5.3.1.2.

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https://bugs.launchpad.net/bugs/1034999

Title:
  libreoffice-calc very slow to open/save documents with large cell
  contents

Status in libreoffice package in Ubuntu:
  Confirmed

Bug description:
  Libreoffice-calc 3.6 takes a long time (30sec to minutes) to open/save
  spreadsheets containing cells with a lot of content. This is a
  regression from libreoffice 3.5 in 12.04 (tested with
  1:3.5.4-0ubuntu1)

  To reproduce:
  1) Open the attached spreadsheet, which contains 1 cell with ~4k characters 
in it

  Expected results:
  Spreadsheet opens quickly (<2sec on my 2.4Ghz Core2Duo w/ SSD)

  Actual results:
  Libreoffice splash screen shows, libreoffice window is displayed as a gray 
rectangle with no content, and libreoffice window then becomes unresponsive. 
CPU usage is at 100% on one core. The system stays in this state for ~30sec. 
The document eventually opens and libreoffice functions normally.

  Saving documents with lots of data in a cell takes just as long as
  opening/reading those documents, with similar symptoms - libreoffice
  becomes unresponsive, one CPU core is at full utilization, etc.

  The amount of text in the cell is directly correlated to the length of
  time required to open/save the doc.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: libreoffice-calc 1:3.6.0~rc4-0ubuntu2
  ProcVersionSignature: Ubuntu 3.5.0-8.8-generic 3.5.0
  Uname: Linux 3.5.0-8-generic x86_64
  ApportVersion: 2.4-0ubuntu6
  Architecture: amd64
  Date: Thu Aug  9 13:20:27 2012
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta amd64 (20100901.1)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: libreoffice
  UpgradeStatus: Upgraded to quantal on 2012-08-07 (2 days ago)

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