[Bug 1590804] Re: fontconfig initialization spends most of its time parsing XML configuration files in /etc/fonts/conf.d/

[Florian Boucault]

The output of strace shows that fontconfig opens those file during every
QML application startup.

A solution to this would be to introduce a caching system: after
fontconfig opens and parses those files the first time it could
serialize the result to disk for subsequent starts.

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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.

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