I believe I'm facing same issues. Please see https://bugs.kde.org/show_bug.cgi?id=378227. I'm using Kubuntu 16.10.
** Bug watch added: KDE Bug Tracking System #378227 https://bugs.kde.org/show_bug.cgi?id=378227 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to fontconfig in Ubuntu. https://bugs.launchpad.net/bugs/1614870 Title: Problems with font cache after update Status in fontconfig package in Ubuntu: Confirmed Bug description: After last update on my 14.04 trusty machine, it takes a long time to regenerate the fonts cache. Now after that, most graphical applications take about 30 seconds to start with 100% CPU load. It is impossible to work with my system in this state. I already tried purging and reinstallong all fontconfig-related packages and completely deleted and rebuildt my font cache, but the problem persists. Before the update everything was fine. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: fontconfig 2.11.0-0ubuntu4.2 ProcVersionSignature: Ubuntu 3.13.0-93.140-generic 3.13.11-ckt39 Uname: Linux 3.13.0-93-generic x86_64 NonfreeKernelModules: fglrx ApportVersion: 2.14.1-0ubuntu3.21 Architecture: amd64 CurrentDesktop: MATE Date: Fri Aug 19 10:11:10 2016 InstallationDate: Installed on 2014-04-16 (856 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326) SourcePackage: fontconfig UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fontconfig/+bug/1614870/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp