load font extremely slowly on macos than in windows and linux.

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use example match_font, run it with following arguments in macos.
./match-font "PingFang SC"
"PingFang SC" is a macos default CJK font. This call will cost 3~5 seconds.
I discovered that if you put the font in user ~/Library/fonts, it runs fast. But loading fonts in system fonts path will cost more time.

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on macos
the example of the crate "./list-fonts" will cost several minutes, really realy slow.