What is maturin opt-level?

[erikpa1]

Hi, I have algorithm for select millions of documents from mongo, but I have big issue with pyo3 / maturin performance.

in python select takes: 18 sec
in rust --debug 30 sec.
in rust --release 18 sec (no idea how it can be as fast as python,... there is some c mongo db package, but anyway there are a multiple layers of python too ))
in maturin build or maturin develop mode my select is 45 sec!!!

I do only:

import rustmodule
rustmodule.analyse(0, today())

no swapping between rust and python during iteration.. any idea or simmilar experience?

[erikpa1]

Nah, I'm idiot, I have copy script which takes files from venv to my python , and my dll was open, so copy failed..... and there was always old code. maturin develop --release has 17 seconds query :)