[Fontconfig-bugs] [Bug 105085] New: Performance concerns when larger CJK fonts are installed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105085

            Bug ID: 105085
           Summary: Performance concerns when larger CJK fonts are
                    installed
           Product: fontconfig
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: fc-cache
          Assignee: fontconfig-bugs at lists.freedesktop.org
          Reporter: jeffbai at aosc.io
        QA Contact: freedesktop at behdad.org

As it currently stands, fc-cache seems to struggle quite a bit when handling
CJK fonts - in this example, the Noto Sans CJK family. On a Sandy Bridge laptop
with an i7-2860QM processor, the process could take up to a minute, during
which it is impossible to run new graphical/X11 programmes - Firefox could also
lock up.

On my setup with Freetype 2.8.1 and Fontconfig 2.12.6, with Noto Sans (full
set) and Noto Sans CJK installed, fc-cache could take up to 2 minutes to finish
the process (!).

A wonder would be, could fc-cache implement...

- Some sort of optimisation for these larger fonts?
- Parallelisation, so that it could take advantage of a
multi-core/multiprocessor system? As it currently stands, fc-cache only
utilises one processor core.

I do apologise for the lack of technicality in this bug report, but please take
this into your consideration - I can provide aid with clarification or
operations if needed.

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