A few years ago I made similar performance measurements based on the Are-we-fast-yet benchmark suite; here are some results: https://github.com/rochus-keller/Oberon/blob/master/testcase...

There are always benchmarks where the one or the other might be faster; this is the reason why we use benchmark suites and geometric means of the factors to make the comparison more representative.

In the above results, Node.js was twice as fast as C++ in the Storage benchmark, and equally fast in Richards and CD, but overall C++ was twice as fast.

Implementations can differ significantly, which you confirmed with the two C++ implementations you measured. The Are-we-fast-yet suite includes guidelines (see https://github.com/smarr/are-we-fast-yet/blob/master/docs/gu...) for this purpose which must be followed by new implementations, and which assure comparability.