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Performance Tuning the Frontend (UI)

Use "cluster mode" of PM2 to avoid Node.js using a single CPU

If you are using PM2 to run the User Interface, you may want to start it using PM2's "Cluster Mode".  This allows Node.js applications to be scaled across multiple CPUs by using the NodeJS cluster module.  See the PM2 Cluster Mode documentation at https://pm2.keymetrics.io/docs/usage/cluster-mode/

# Start the "dspace-ui" app clustering across all available CPUs
pm2 start dspace-ui.json -i max

Give Node.js more memory

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.

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