IntelliJ IDEA 2019.2 Help

Increase memory heap

The Java Virtual Machine (JVM) running IntelliJ IDEA allocates some predefined amount of memory. The default value depends on the platform. If you are experiencing slowdowns, you may want to increase the memory heap.

  1. From the main menu, select Help | Change Memory Settings.

  2. Set the necessary amount of memory that you want to allocate and click Save and Restart.

This changes the value of the -Xmx option used by the JVM and restarts IntelliJ IDEA with the new setting. For more information, see Configuring JVM options.

IntelliJ IDEA also warns you if the amount of free heap memory after a garbage collection is less than 5% of the maximum heap size:

The Low Memory warning

Click Configure to increase the amount of memory allocated by the JVM:

The Memory Settings dialog

Click Save and Restart and wait for IntelliJ IDEA to restart with the new memory heap setting.

Last modified: 17 October 2019