Almost everyone running Node in a machine with multiple cores is using multithreading. Node is multithreaded by default. I believe the default setting is using

Almost everyone running Node in a machine with multiple cores is using multithreading. Node is multithreaded by default. I believe the default setting is using 4 threads. Most of Node is written in C++. The JS code written by end users is single threaded (most of it at least) but IO etc is all executed with libuv. https://docs.libuv.org/en/v1.x/threadpool.html#threadpool https://docs.libuv.org/en/v1.x/threadpool.html#threadpool