Why are the fonts in Document Viewer so ugly and non-antialiased?
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My guess is that you see this behavior only for some documents, right?
In that case I think that you see output from an old LaTeX version with standard LaTeX bitmap fonts. I have found the document that you are showing and the fonts are non-aliased also on my system -- although I know that regular documents look perfect. It's also non-aliased under Windows, so there.