We switched over from our old NodeJS backend to a new Go backend recently, and gave the website an overhaul as well, things were a bit shaky during the transition.
I wrote the old codebase ~4 years ago when I was just learning NodeJS, and didn't touch it too much after that, so it was in dire need of being replaced, in particular since it wasn't really written to scale horizontally.
Didn't have any particular issues with NodeJS in terms of performance, just felt like using Go when I was rewriting it.