If you are using a standalone instance not managed by the Toolbox App, and you can't start it, it is possible to manually change the -Xmx option that controls the amount of allocated memory. If the IDE instance is currently running, the new settings will take effect only after you restart it. On the instance settings tab, expand Configuration and specify the heap size in the Maximum heap size field. Open the Toolbox App, click the settings icon next to the relevant IDE instance, and select Settings.

If you are using the Toolbox App, you can change the maximum allocated heap size for a specific IDE instance without starting it. Right-click the status bar and select Memory Indicator.

Use it to judge how much memory to allocate. IntelliJ IDEA can show you the amount of used memory in the status bar. If you are not sure what would be a good value, use the one suggested by IntelliJ IDEA.Ĭlick Save and Restart and wait for IntelliJ IDEA to restart with the new memory heap setting. 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:Ĭlick Configure to increase the amount of memory allocated by the JVM. For previous versions or if the IDE crashes, you can change the value of the -Xmx option manually as described in JVM options.

The Change Memory Settings action is available starting from IntelliJ IDEA version 2019.2. Restart IntelliJ IDEA for the new setting to take effect. This action changes the value of the -Xmx option used by the JVM to run IntelliJ IDEA. Set the necessary amount of memory that you want to allocate and click Save and Restart. If you want to configure the heap size for the build process that compiles your code, open Settings/Preferences Ctrl+Alt+S, select Build, Execution, Deployment | Compiler, and specify the necessary amount of memory in the Build process heap size field.įrom the main menu, select Help | Change Memory Settings. The heap size allocated for running the IDE is not the same as the heap size for compiling your application. If you are experiencing slowdowns, you may want to increase the memory heap. The default value depends on the platform. The Java Virtual Machine (JVM) running IntelliJ IDEA allocates some predefined amount of memory.

Ultimate memory increaser