JDeveloper Memory And Performance

As a general rule, Java is optimized for throughput, not latency. Once the garbage collector kicks in, performance drops like a rock. A 2 second pause every once in a while is OK for a server, but for an IDE it's misery. So here's the fix:

1. Go to your JDeveloper root directory, is should be something like C:\Oracle\jdev\Middleware\jdeveloper
2. Open the file ide\bin\ide.conf, scroll down to the default memory settings:

        AddVMOption  -Xms128M
        AddVMOption  -Xmx768M

3. Boost the memory to something larger, like so:

        AddVMOption  -Xms1024M
        AddVMOption  -Xmx1024M

4. Open the file jdev\bin\jdev.conf
5. Add the following config settings:

        # 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

6. Then restart JDeveloper... If it doesn't start, you'll need to reduce the amount of memory allocate in the ide.conf file from step 3.