[issue32346] Speed up slot lookup for class creation

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

./python -m timeit -- "class A: pass"
- before: 6.63 usec per loop
- after:  5.41 usec per loop

./python -m timeit -s "class A: pass" -- "class B(A): pass"
- before: 7.04 usec per loop
- after:  4.91 usec per loop

./python -m timeit -s "class A: pass" -s "class B(A): pass" -- "class C(B): pass"
- before: 8.24 usec per loop
- after:  5.09 usec per loop

./python -m timeit -s "class A: pass" -s "class B(A): pass" -s "class C(B): pass" -- "class D(C): pass"
- before: 9.59 usec per loop
- after:  5.29 usec per loop

./python -m timeit -s "class A: pass" -s "class B(A): pass" -s "class C(B): pass" -s "class D(C): pass" -- "class E(D): pass"
- before: 10.9 usec per loop
- after:  5.45 usec per loop

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32346>
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