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On machines with >2GB of memory available, Node will only use a maximum of 2GB of memory by default (see https://github.com/nodejs/node/issues/28202).  This 2GB of memory should be enough to build & run the User Interface, but it's possible that highly active sites may require 4GB or more.

If you want to increase the memory available to Node.js, you can set the NODE_OPTIONS environment variable:

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Note
titleJava Heap Memory Recommendations

At the time of writing, DSpace recommends you should give Tomcat >= 512MB of Java Heap Memory to ensure optimal DSpace operation. Most larger sized or highly active DSpace installations however tend to allocate more like 1024MB (1GB) to 2048MB (2G) or more ) of Java Heap Memory.

Performance tuning in Java basically boils down to memory. If you are seeing "java.lang.OutOfMemoryError: Java heap space" errors, this is a sure sign that Tomcat isn't being provided with enough Heap Memory.

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