Earlier quoted context omitted.
I interpreted "at the same time" as "without blocking", But sure you could also add parallelism using a few built-in Node modules (there's cluster and worker threads, also don't know if atomics are already in Node, they are in V8), It's not trivial anymore but also not that hard. A newcomer could figure it out in ~30 mins from the docs.
Gotcha, sounds like we interpreted it differently. I appreciate you taking the time to clarify, I am an old hand as JS but didn't know true parallelism had become feasible these days. Thank you, sincerely!
During my PhD we had to crunch some numbers and my group usually makes use of C++ with libs for that. I tried doing it in Node using cluster and let it spread through our whole cluster of nodes (funny how it plays on words) and performance was worse obv. but not that bad, it was about 2x slower, but with that I was able to write code and test it in hours instead of days, and it didn't matter to me if a program that was going to take 2 hours was now taking 4 as I was going home anyway and check it out next morning ¯\_(ツ)_/¯. Plus, my experiment had a REST API for free (well, like 8 lines of code) and when I showed that to them they were :O.