-Xmx600m
java -Xmx600m -Dsun.java2d.noddraw=true ...
On the Mac OS X platform to add or modify a startup parameter you have to Ctrl-click on the <oXygen/> XML Diff application icon in Finder, in the pop-up menu select Show Package Contents, then in the Contents directory you edit the file Info.plist: in the key VMOptions you modify the parameter if it already exists in that key or you add it after the model of the existing parameters inside that key.
On the Linux platform you have to create a file called diffFiles.vmoptions if it does not exist already and specify the parameter exactly as in the case of the .vmoptions file on the Windows platform.
If you use the All platforms distribution you have to add or modify the startup parameter that you want to set in the Java command line at the end of the startup script diffFiles.bat or diffDirs.bat on Windows, diffFilesMac.sh or diffDirsMac.sh on Mac OS X and diffFiles.sh or diffDirs.sh on Linux. All these files are located in the installation directory. For example to set the maximum amount of Java memory to 600 MB on Windows the -Xmx parameter must be modified in the java command line at the end of diffFiles.bat like this:
java -Xmx600m -Dsun.java2d.noddraw=true ...
on Mac OS X the java command at the end of diffFilesMac.sh should look like:
java "-Xdock:name=DiffFiles"\ -Dcom.oxygenxml.editor.plugins.dir="$/OXYGEN_XML_DIFF_HOME/plugins"\ -Xmx600m\ ...
and on Linux the java command at the end of diffFiles.sh should look like:
java -Xmx600m\
"-Dcom.oxygenxml.editor.plugins.dir=$OXYGEN_XML_DIFF_HOME/plugins"\