[Fontconfig] Application startup performance

[LRN]

I've been reading through this thread and have a question: does FC really
have to have complete list of the installed fonts (in form of a cache) at
startup? What happens if it has no cache at all (and assuming that it won't
try to build a cache) or if cache is outdated?
Separately: what happens if a font is installed while an application is
running? Would FC (as it is now) rebuild a cache? Would that affect the
application?

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