Text in Postscript files is excellent in general. This was either scanned and then OCR'd to allow copying text, or converted from PS to PDF badly. Here's a bet

Text in Postscript files is excellent in general. This was either scanned and then OCR'd to allow copying text, or converted from PS to PDF badly. Here's a better version: https://users.soe.ucsc.edu/~cormac/papers/pldi93.pdf https://users.soe.ucsc.edu/~cormac/papers/pldi93.pdf There's still pixellation if you zoom the font. That could be due to the type of font that was originally used, and/or due to the conversion. Note that the article is over 30 years old. Technology has improved a lot since then. A typical screen resolution in 1993 was 800x600.