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And it is severely underrated. Even though performance gain is aevrate around 4x-20x. Used in production and memory usage is also about 1/6th of CPython. Can get 10x perfromance easily in many cases.

> Used in production and memory usage is also about 1/6th of CPython

I thought it would have higher memory usage? (based only on reading)

I suspect their relative memory efficiency depends on the size of the program and the size of the data it's processing.

Somewhat paradoxically, PyPy always uses more memory for programs with small working sets, but can use less memory for programs with large working sets. 1/6 is a lot more extreme than I would have expected, though.

No, it has drastically less memory requirements. It's very similar to my perl compiler, and even in non-optimizing mode it uses much less memory. In optimizing mode it's almost the same as this one. Just ~20 years older.

I experimented with SQLite, trying to insert many rows in under a minute. I ran my script with PyPy, with zero changes and it was 4x times faster!

code here: https://github.com/avinassh/fast-sqlite3-inserts

my blog post: https://avi.im/blag/2021/fast-sqlite-inserts/

What does “literally” buy you here?