Raspberry Pi, freeing up unused memory sooner

This might be a hardware question. node-red-pi --max-old-space-size=256
Does that need to be run every time?

Source: Running on Raspberry Pi : Node-RED

If you installed node-red using the recommended script then it will have installed a systemd script that will do that for you if you start/stop using
and tell it to autostart on boot
sudo systemctl enable nodered

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