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https://issues.apache.org/jira/browse/PDFBOX-5779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17823908#comment-17823908
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Tilman Hausherr commented on PDFBOX-5779:
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There will always be a difference because of the reading in memory of the whole
stream. Arial.ttf has a size of 1MB.
I looked in the code re: caching. The glyph table is not read in full. Thus
reading from a file will have less disk access.
If you are doing a mass mailing with the same font(s) then the best is to read
the font(s) only once and into a {{TrueTypeFont}} object. This one survives the
closing of the document.
> Loading font streams has poorer performance compared to loading font files
> --------------------------------------------------------------------------
>
> Key: PDFBOX-5779
> URL: https://issues.apache.org/jira/browse/PDFBOX-5779
> Project: PDFBox
> Issue Type: Improvement
> Affects Versions: 3.0.1 PDFBox
> Reporter: bai yuan
> Priority: Major
> Attachments: arial.ttf, pdfbox-1.java, pdfbox.java
>
>
> Run the attached program, then open the code on line 41 and comment out the
> code on line 44, and compare the time consumption of the two font loading
> methods.
> Why does using font streams have poorer performance compared to using font
> files? Is this a limitation? If I can only use font streams, are there any
> ways to improve performance?
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