Hmmm, after some digging into this issue with Tim, we may have uncovered the culprit. It looks like the 'LanguageTool' LibreOffice extension is causing the high CPU load, not LibreOffice itself.
When installed, opening a large document will send LibreOffice's CPU usage skyrocketing. After a few minutes (depending on the size of the document), the usage does eventually drop back down below 5% again. When uninstalled, opening a large document inhibits a short spike in CPU usage, but quickly drops off. Tim, would you mind filing an upstream bug report for this at https://bugs.documentfoundation.org/enter_bug.cgi?product=LibreOffice&format=guided and sharing the link to that bug here? For the Component field, select "Extensions". Thank you! -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to libreoffice in Ubuntu. https://bugs.launchpad.net/bugs/1825513 Title: High CPU usage when large document open Status in LibreOffice: New Status in libreoffice package in Ubuntu: Won't Fix Bug description: Description: CPU usage spikes to 110-130% (across 4 cores) when a large document (~260 pages, mainly text) is opened. Steps to reproduce: Open large document Observe CPU spike and fan spin up Close file Observe CPU drop and fan spin down Expected result: Small spike in CPU usage while opening, overall slight increase in CPU usage, total to remain >10% Reproducible: Always User Profile Reset: No. Bug also filed against Libreoffice 6.2.2 installed on Ubuntu 18.10 via PPA. See: https://bugs.documentfoundation.org/show_bug.cgi?id=124346 ProblemType: Bug DistroRelease: Ubuntu 19.04 Package: libreoffice-writer 1:6.2.2-0ubuntu2 ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6 Uname: Linux 5.0.0-13-generic x86_64 ApportVersion: 2.20.10-0ubuntu27 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Fri Apr 19 22:04:37 2019 InstallationDate: Installed on 2019-02-04 (74 days ago) InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3) SourcePackage: libreoffice UpgradeStatus: Upgraded to disco on 2019-04-19 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/df-libreoffice/+bug/1825513/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
