Does PDFium memory cache any file resources like fonts and images etc？

[南风不竞]

Recently I was working on benchmarks between MuPDF and PDFium. In most scenario, PDFium is slower than MuPDF whether skia is enabled or not. 

MuPDF does cache fonts, images and other resources internally in a global context, so they can avoid reloading resources each time they are required.  

So I was wondering whether PDFium has cache mechanism like above. If not, maybe this could help on either parsing or rendering document. If PDFium does cache resources, what would be the bottlenecks on rendering or parsing.

[Lei Zhang]

Yes, PDFium does do caching internally. For instance,
https://pdfium-review.googlesource.com/116891 made many PDFs that
contain ICC data render a lot faster.

There are already several issues on the PDFium issue tracker where
PDFium renders significantly slower compared to other libraries. If
you see issues, please file reports.

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