Public bug reported:

Description:    Ubuntu 14.04.2 LTS
Release:        14.04
LibreOffice 4.2.7.2 420m0(Build:2)
libreoffice-calc:
  Installed: 1:4.2.7-0ubuntu2
  Candidate: 1:4.2.7-0ubuntu2
  Version table:
 *** 1:4.2.7-0ubuntu2 0
        500 http://ie.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 
Packages
        100 /var/lib/dpkg/status
     1:4.2.7-0ubuntu1 0
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 
Packages
     1:4.2.3~rc3-0ubuntu2 0
        500 http://ie.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
I expected the file write to take some time, but I did not expect it to take as 
long or to consume that much CPU. 
The GUI for libreoffice calc was unresponsive (grayed out) throughout the 
entire process. 
Repeatable process, occurs when writing files only. 
One CPU is used at 100% for perhaps 5 minutes. 
Has only started happening in past fortnight.
I'm using the proprietary NVidia driver on 14.04. 
Additionally, I have cuda-7.0 installed from the Nvidia repositories.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: libreoffice-calc 1:4.2.7-0ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-48.80-generic 3.13.11-ckt16
Uname: Linux 3.13.0-48-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.8
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Apr  1 19:36:07 2015
InstallationDate: Installed on 2014-11-22 (129 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: libreoffice
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: libreoffice (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1439336

Title:
  when writing a file 7 cols by 500K rows, libreoffice becomes
  unresponsive and utilises 100% CPU.

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