Then in a couple of minutes the whole system slow down because of memory consumption until everything stop.
As you can see in the graph below when I start the addon the memory consumption goes up…
Here is my top output for the three processes involved for zigbee2mqtt on my nuc
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1577 nick 20 0 923248 76604 27588 S 0.3 1.0 38:48.85 node
890 nick 20 0 733440 40624 25524 S 0.0 0.5 0:00.34 npm
1564 nick 20 0 4632 852 784 S 0.0 0.0 0:00.00 sh