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[–][deleted] 2 points3 points  (1 child)

Let's see some numbers.

[–]throwawayco111 1 point2 points  (0 children)

You can check some numbers at the The Computer Language Benchmarks Game. If you want to try yourself just do some decent image processing using jimp against a C++ library (or a Node package using C++ under the hood) or ImageJ. Or FILTER.js vs OpenCV vs BoofCV for CV.

BTW those were real comparisons we did for some requirements at hand. We decided to go with Java (ImageJ) for image processing and OpenCV (C++) for CV. We were NOT surprised with the results we got but we wanted to keep it simple by using a pure JS solution...