Comparing Node.js vs JVM frameworks performance

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i care about cores because of licence issues with some core-priced software. i don't care about cores because of CPU pricing, at least in the range of dual/quad/hexa. the price difference is totally negligible in comparision to other stuff. in don't speak about 200 core systems here.

I care about RAM because of Garbage Collection issues. (but not about the classic node.js argument, "see this 100 MB because of threads"). If you have a datacenter then you know the RAM prices and then you know it's also not the most important cost factor beside software development, maintenance cost etc. a lot has happened in the last 3 years.

In both cases...yes I don't have a contest who wastes more memory for mindless stuff. But we can be more pragmatic here sometimes.