Somehow I did not expect that when I deploy a NodeJS app, that NodeJS would be compiled from source on the server. Time to get coffee and ignore load warnings for a while after deploying an app.....
Edit: nearly 5 hours later at max CPU on a small VPS, and the deployment is still compiling, that's pretty useless. I bet that it doesn't get any updates then as well, and needs to recompile when there's a new version. Big waste of time this..... What's wrong with an apt repository?