Eclipse.ini file
A common way to optimize Eclipse performances is to customize its eclipse.ini file. Here is the content of mine (for Eclipse Luna) : -startup plugins/org.eclipse.equinox.launcher_1.3.0.v20140415-2008.jar -showlocation --launcher.library plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.1.200.v20140603-1326 -product org.eclipse.epp.package.jee.product --launcher.defaultAction openFile --launcher.XXMaxPermSize 256M -showsplash org.eclipse.platform --launcher.XXMaxPermSize 256m --launcher.defaultAction openFile --launcher.appendVmargs -vmargs -server -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:+UnlockExperimentalVMOptions -javaagent:lombok.jar -Xbootclasspath/a:lombok.jar -Dosgi.requiredJavaVersion=1.6 -Xms256m -Xmx1024m -Xverify:none If you don't use Lombok, remove the " -javaagent:lombok.jar " line.