[pjmlp]

Processes eat more resources, and even taking them out of the equation, dynamic language runtimes have less opportunities for good JIT code optimization, at the same level as languages like Java and Go type systems allow for.

In regards to Node, as Python is anyway mostly CPython 99% of the deployments.

[eatonphil]

A fixed process pool of 1 process per core is truly overall more resource intensive than a goroutine per request model in Go?

It would kind of seem like a wash to me, naively.

[pjmlp]

Because you're missing the picture that a goroutine doesn't use the stack size, heap from OS data structures, or CPU context switches into kernel code, as a full blown process.

Let alone the detail that the goroutine is full blown native code, while the node/Python process is interpreted, and even if a JIT is used, many C2 level optimisations are out of reach for dynamic languages.

It is no wonder that even with the herculean effort that has gone into V8, for the ultimate performance it needs help from GPU shaders and WebAssembly, both typed.