PDF Optimizer TextSettings to shink the size of PDF

Q: I am using PDFTron pdftron.PDF.Optimizer to shink the size of PDF
files and am now playing with text options.

// Text Optimization
pdftron.PDF.Optimizer.TextSettings text_settings = new
pdftron.PDF.Optimizer.TextSettings();
text_settings.EmbedFonts(value);
text_settings.SubsetFonts(value);

My question is :
When the value is "true" I guess you integrate the fonts into the new
generated PDF
But when the value if "false" what is the adapted system, Do you
remove all fonts ? Or removing unused fonts from the PDF ?
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A: When EmbedFonts is true, the Optimizer will embed missing fonts.
When EmbedFonts is false, the Optimizer will not embed any fonts and
will not remove any existing (i.e. embedded) fonts.

When SubsetFonts is true, the Optimizer will subset embedded fonts.
When SubsetFonts is false, the Optimizer will not subset existing
fonts.