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  1. Open the Preferences dialog (Window > Preferences on Windows)
  2. Expand the tree to "Java/Installed JREs"
  3. Click on the JRE that has a checkmark (your default JRE)
  4. Click "Edit..."
  • In "Default VM Arguments", fill in the max heap size you want using the -Xmx argument. For example, -Xmx3500m will give you a max heap size of 3500 MB
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