If you'd like to experiment, here's what you need to do.
- Create a folder named '.OpenStep' in your home directory (mkdir ~/.OpenStep).
- Create a file called 'environment' containing one line of text:
QDTEXT_ANTIALIASING=0;QD_MINSIZE=18
From the terminal, vi ~/.OpenStep/environment and then type the above line. Save the changes and quit. I'm guessing that QD_MINSIZE is the size below which the anti-aliasing is disabled.
- Logout and login again, and you should (might?) have less anti-aliasing than you did previously.

