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What is stopping PyPy from getting more widespread adoption in the Python community? Surely it isn't that everyone is using the latest version of CPython; it's been years and many are still using 2.7.

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The startup times are a fair bit worse, and the memory requirements are a fair bit higher. Despite everything else python does tend to be fast enough, and the worse startup/memory usage isn't necessarily worth it.

Also it doesn't speed up things that rely on external C libraries, so code using numpy/scipy/tensorflow/etc doesn't generally run appreciably faster.

If it hasnt changed, and I wasn't wrong in the first place, it has some issues with deep C integration, you need to jump over some hoops to get numpy working, and some of the other powerhouse libraries.

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