Based on some googling, it seems like Macromedia Director defaulted to 30 fps but could be customized for all or portions of a piece. eg https://flylib.com/boo

Based on some googling, it seems like Macromedia Director defaulted to 30 fps but could be customized for all or portions of a piece. eg https://flylib.com/books/en/4.258.1.47/1/ https://flylib.com/books/en/4.258.1.47/1/ I agree 75 would be surprising and I like your speculations!