intellij-idea Optimization Customizing the VM Options
Example
You can override the default vmoptions with your own personal settings by choosing Help > Edit Custom VM Options from the toolbar. This will create a local copy of the file which you are free to edit.
For example, if you double the value set for Xmx, the maximum size of the memory allocation pool will be doubled after you restart the IDE. On many machines this will lead to faster performance.
See the options here for a description of each parameter.
