All graphics print slowly on dot matrix printers. Going to PDF is just complicating the process. Many if not most dot matrix printers can already print TrueType fonts, but just very slowly because they are graphic-based. To print fast, the fonts need to be printer embedded. One can find the printer-embedded fonts by looking for the printer symbol in the Windows font folder as opposed to the TT symbol. Select the closest printer embedded font that fits your needs. When looking to buy a new dot matrix printer, be sure to find out what fonts are embedded or can be embedded in printer memory.
Should I buy a Bowflex or a Weider Crossbow?