CPU Usage spikes - how to identify problems

[deme]

Digging a bit deeper, apparently, this topic had been discussed / worked on before:

• Easy way to remove lag?
• https://github.com/node-red/node-red.github.io/wiki/Analysing-Performance

Has someone worked with one of these tools before?

• https://nodejs.org/en/docs/guides/simple-profiling/
• https://nodejs.org/en/docs/guides/diagnostics-flamegraph/
• https://github.com/RuntimeTools/appmetrics