After installing, create .foprc in your home dir with the following FOP_OPTS="-Xmx###m" FOP_HOME="/opt/fop" Delete and replace the #'s with the amount of RAM your computer has in megabytes. Use can run "free -m" in the terminal to get the info: Example : FOP_OPTS="-Xmx1024m" // If you have a GB RAM FOP_HOME="/opt/fop"