docs(performance): remove section on literal vs enum performance

[ollz272]

Change Summary

I've removed the docs on the performance differences between using a literal or an enum. It seems the performance improvements made in 2.7 have made them perform nearly identically in the previous example, so unless theres a case missing, it doesn't seem worth promoting this tip anymore.

Related issue number

Checklist

• The pull request title is a good summary of the changes - it will be used in the changelog
• Unit tests for the changes exist
• Tests pass on CI
• Documentation reflects the changes where applicable
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

Selected Reviewer: @davidhewitt

[codspeed-hq]

CodSpeed Performance Report

Merging #9262 will not alter performance

_{Comparing ollz272:docs-change (ec56183) with main (ae71183)}

Summary

✅ 13 untouched benchmarks

[ollz272]

So for some benchmarks, using the following script:

import enum
from timeit import timeit

from typing_extensions import Literal

from pydantic import TypeAdapter

ta = TypeAdapter(Literal['a', 'b'])
result1 = timeit(lambda: ta.validate_python('a'), number=1000000)


class AB(str, enum.Enum):
    a = 'a'
    b = 'b'


ta = TypeAdapter(AB)
result2 = timeit(lambda: ta.validate_python('a'), number=1000000)
print(result2 / result1)

on 2.6.4 -> 2.80
on 2.7.0 -> 0.99

Im using a 2022 M2 macbook, maybe results differ on other platforms.

[ybressler]

Looks good to me. Thanks for the detailed performance comment.

(Also, I'm not a maintainer, just reviewing some PRs informationally)

[ollz272]

please review

[sydney-runkle]

@ollz272,

Nice work! Thanks!!