Is your JDeveloper 12c too slow, follow these 3 basic steps and increase perfomance of JDeveloper 12c (12.1.3) Step 1: Configure JVM settings in jdev.conf Path: $MV_HOME$/jdeveloper/jdev/bin/jdev.conf # optimize the JVM for strings / text editing AddVMOption -XX:+UseStringCache AddVMOption -XX:+OptimizeStringConcat AddVMOption -XX:+UseCompressedStrings # if on a 64-bit system, but using less than 32 GB RAM, this reduces object pointer memory size AddVMOption -XX:+UseCompressedOops # use an aggressive garbage collector (constant small collections) AddVMOption -XX:+AggressiveOpts # for multi-core machines, use multiple threads to create objects and reduce pause times AddVMOption -XX:+UseConcMarkSweepGC AddVMOption -DVFS_ENABLE=true AddVMOption -Dsun.java2d.ddoffscreen=false AddVMOption -XX:+UseParNewGC AddVMOption -XX:+CMSIncrementalMode AddVMOption -XX:+CMSIncrementalPacing AddVMOption -XX:CMSIncrementalDutyCycleMin=0 AddVMOption -XX:CMSIncrementalDutyCycle=10...