[Fontconfig] Application startup performance

[Keith Packard]

Patrick Haller <patrick.haller at haller-consult.de> writes:

> - assuming that readdir() will never return duplicate filenames within 
> the very same directory.

If readdir is getting called at each application startup, there's a
problem with the caching mechanisms in fontconfig that should get fixed.

>                          Unoptimized     Optimized
> user[s]                         0,806         0,579

This will be a nice improvement, even when the caching bugs are fixed,
for times when the cache does need to get regenerated.

-- 
-keith
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