from dataclasses import dataclass, fields
from timeit import timeit

import msgspec
msgspec_fields = msgspec.structs.fields


@dataclass
class D:
    x: int
    y: int | None = None
    z: str | None = None

class M(msgspec.Struct):
    x: int
    y: int | None = None
    z: str | None = None

d = D(1)
m = M(1)

print("dataclass.fields = ", end="")
print(timeit(lambda: fields(d), number=1000000))

print("msgspec.structs.fields = ", end="")
print(timeit(lambda: msgspec_fields(m), number=1000000))