Python 3.11 is about 45-50% faster for simple functions than previous versions of python.

	version	count	mean	latest_improvement
0	3.7.17	100	0.425265	0.551687
1	3.8.18	100	0.399123	0.522323
2	3.9.18	100	0.406086	0.530513
3	3.10.13	100	0.390124	0.511304
4	3.11.7	100	0.188615	-0.0107982
5	3.12.1	100	0.190652	0

Here mean is the average duration (in seconds) for calculating fibonacci sequence (30th value).

Here's the fibonacci function.

def fibonacci(n):
    if n == 0:
        return 0
    if n == 1:
        return 1
    return fibonacci(n-1) + fibonacci(n-2)

n was 30 (constant), and 100 iterations were run for each version of python