Modify JVM properties

The table below lists of useful Java Virtual Machine (JVM) properties you can add, remove, or change to achieve specific purposes.

Changes	Comments
Add -Dgroovy.use.classvalue=true, -Dgroovy.target.indy=true	Improve the Groovy engine for Bot Configurations.
Remove -XX:PermSize, -XX:MaxPermSize, -XX:MaxNewSize=1400m, -XX:NewRatio=5, -XX:NewSize=1400m, -XX:SurvivorRatio=16 and change -Xms10G -Xmx18G to -Xms18G -Xmx18G	Replace parameters for Java 8 meta space. Note: From v10.3, Java 8 is deprecated and available only for backward compatibility.
Add -XX:+HeapDumpOnOutOfMemoryError and -XX:HeapDumpPath=path	Create a heap dump upon a crash.
Add -XX:+UseCompressedOops. If you have less than 32 GB heap.	The JVM property has a special setting that forces using the 32-bit index internally (read: pointers-like). This allows to address 4 294 967 295 objects * 8 bytes address => 32 GB of memory. (NOT to be confused with the 4GB address space for REAL pointers). It reduces the overall memory consumption with a potential positive impact on all caching levels.
Add -XX:+UseG1GC and remove -XX:+CMSClassUnloadingEnabled, -XX:+UseConcMarkSweepGC	Improve garbage collection.
Add -XX:+AggressiveOpts	Enables you to use aggressive performance optimization features expected to become default in upcoming releases. By default, this option is disabled, and experimental performance features are not used.

For more information about JVM, refer to the Java documentation.