Performance comparison of slotted vs non-slotted class in python3.11. Based on https://www.youtube.com/watch?v=Fot3_9eDmOs.

cmp_slot_noslot.py

#!/usr/bin/python3.11
from typing import Union
from functools import partial
import timeit


class Foo:
    __slots__ = "name", "age"
    def __init__(self, name : str, age : int) -> None:
        self.name = name
        age = age

class FooNoSlot:
    def __init__(self, name : str, age : int) -> None:
        self.name = name
        age = age

f = Foo(name="Foo", age=35)
fns = FooNoSlot(name="Foo", age=35)

def crud(f : Union[Foo, FooNoSlot]):
    f.name = "Test"
    f.name
    del f.name

t1 = min(timeit.repeat(partial(crud, f), repeat=10, number=10000))
t2=  min(timeit.repeat(partial(crud, fns), repeat=10, number=10000))

print(f"Slotted performed {t2/t1 -1:.2%} better.")