## Below are my benchmarks for this change.

from operator import itemgetter, attrgetter
from pyperf import Runner

class MyClass:
    __slots__ = "a", "b"

namespace = {'itemgetter': itemgetter,
             'attrgetter': attrgetter,
             'MyClass': MyClass,
             }

runner = Runner()
runner.timeit(
    name="itemgetter",
    setup="f = itemgetter(1); x = (1, 2, 3)",
    stmt="f(x)",
    globals=namespace
)
runner.timeit(
    name="attrgetter",
    setup="f = attrgetter('b'); x = MyClass(); x.a = x.b = 1",
    stmt="f(x)",
    globals=namespace
)

##### Results #####
# itemgetter: Mean +- std dev: [operator_main] 45.3 ns +- 1.3 ns -> [operator_vec] 29.5 ns +- 0.7 ns: 1.54x faster
# attrgetter: Mean +- std dev: [operator_main] 61.6 ns +- 1.7 ns -> [operator_vec] 43.8 ns +- 0.9 ns: 1.41x faster

New changeset 0a145069e807fdafd1fa0315b9bc22da363d2d39 by Dennis Sweeney in branch 'main':
bpo-44953: Add vectorcall for itemgetter and attrgetter instances (GH-27828)
https://github.com/python/cpython/commit/0a145069e807fdafd1fa0315b9bc22da363d2d39

New changeset 035414a878a772d1d293cdecdc4470bcce5e5d7a by Dennis Sweeney in branch 'main':
bpo-44953: Add newline at end of NEWS entry (GH-31265)
https://github.com/python/cpython/commit/035414a878a772d1d293cdecdc4470bcce5e5d7a