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> Sure, but what's not really python per se. One could also call C++ libraries from java via JNI and pretend java is super fast.

But that's how every scripting language obtains good-not-just-decent performance. A strong culture of dropping down to C for any halfway-important library is why PHP's so hard to beat in real-world use, speed-wise (whatever its other shortcomings).

> Sure, but what's not really python per se.

But that's exactly the strength of Python: it's an interface language. It's meant to make pretty sophisticated things like CUDA easy for everyone.

Java is super fast though, it almost never uses JNI as it doesn’t need it as opposed to Python. It uses JNI for integrating with the C world (e.g. opengl bindings).