>From the attached backtrace, It seems that Qt calls FcInitReinitialize when populating its font database (a QGenericUnixFontDatabase instance provided by Qtubuntu) - that explains why re-parses the conf files everytime.
See http://code.qt.io/cgit/qt/qtbase.git/tree/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp?h=v5.4.1#n439 ** Attachment added: "backtrace.txt" https://bugs.launchpad.net/ubuntu/+source/fontconfig/+bug/1590804/+attachment/4689148/+files/backtrace.txt -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to fontconfig in Ubuntu. https://bugs.launchpad.net/bugs/1590804 Title: fontconfig initialization spends most of its time parsing XML configuration files in /etc/fonts/conf.d/ Status in Canonical System Image: New Status in fontconfig package in Ubuntu: New Bug description: While profiling the startup of QML apps on the BQ E4.5 phone (armhf) I noticed that a significant amount of time (around 35ms) was spent solely on parsing the XML configuration files in /etc/fonts/conf.d/ There seems to be around 40 files on Ubuntu Phone in that directory. To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1590804/+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