[Fontconfig] no `stable' cache file in `~/.fonts'

[Werner LEMBERG]

>> [I noticed the issue mainly because I have `NotoCJKSans.ttc' (file
>>  size 112MByte) in the `~/.fonts' directory, and it takes a loong time
>>  until the many different faces in the TTC are scanned.]
> 
> Speaking of which, it was 5x faster with non-Adobe CFF code in
> FreeType.

Hmm.  This looks like something to be fixed.  Can you provide some
meaningful gprof output for the current git version of FreeType?

> Maybe we should use FT_Property_Set to enable faster one if it's
> available.

I consider this as a last resort if there is really a fundamental
design problem with the Adobe CFF engine that prevents a speed-up.


    Werner