Conversion will be much slower on Python 3.9.6

[TimYao18]

After benchmarking M1, M2, and M2 Pro, I found that the conversion on Python 3.9.6 is much slower compared to Python 3.11.5.

On M1, the conversion of RealVisXL 2.0 takes 14XXX seconds on Python 3.9.6, while it only takes 7XXX seconds on Python 3.11.5.
It is approximately twice as slow as on Python 3.11.5.

Is there someone know why? After checking the change notes of Python I didn't found the reason.

[czkoko]

The speed is not normal. If there is no quantitative model, the time should be less than half an hour.

[TimYao18]

Is conversion time so short?
I test M2 Pro on XL based model will still take more than 1.5 hours on Python 3.11.5.

[TimYao18]

3.11 is average of 25%faster than 3.10.
https://docs.python.org/3/whatsnew/3.11.html#faster-cpython