1. Open your installation folder of Netbeans in Ubuntu 12.04 (home/<username>/netbeans-7.x.x).
2. Open "etc" folder edit file "netbeans.conf" file in your favorite editor.
3. Replace this line "netbeans_default_options" with following:
netbeans_default_options="-J-client -J-Xss2m -J-Xms32m -J-XX:PermSize=32m -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.graphics.UseQuartz=true -J-Dsun.java2d.noddraw=true -J-Dsun.zip.disableMemoryMapping=true -J-Dswing.aatext=true -J-Dawt.useSystemAAFontSettings=on --laf javax.swing.plaf.metal.MetalLookAndFeel"
netbeans_default_options="-J-client -J-Xss2m -J-Xms32m -J-XX:PermSize=32m -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.graphics.UseQuartz=true -J-Dsun.java2d.noddraw=true -J-Dsun.zip.disableMemoryMapping=true -J-Dswing.aatext=true -J-Dawt.useSystemAAFontSettings=on --laf javax.swing.plaf.metal.MetalLookAndFeel"
4. Restart your netbeans then you will see optimized netbeans. see image below:
