Higher level language abstractions still run on top of efficient lower level engines. Python doesn’t run on Python. Node.js runs script code in V8 which is a C++ engine. Typically, the plumbing heavy lifting is done by the lower level code via API calls, and the business logic layer on top is comparatively lightweight.
Of course, a developer could eschew those conventions. But I wouldn’t feel comfortable shipping a video encoder written in something like Python, or even a mid-level abstraction language like Java or Go.
Higher level language abstractions still run on top of efficient lower level engines. Python doesn’t run on Python. Node.js runs script code in V8 which is a C++ engine. Typically, the plumbing heavy lifting is done by the lower level code via API calls, and the business logic layer on top is comparatively lightweight.
Of course, a developer could eschew those conventions. But I wouldn’t feel comfortable shipping a video encoder written in something like Python, or even a mid-level abstraction language like Java or Go.