Łukasz Langa <luk...@langa.pl> added the comment:

I ran all benchmarks on installed optimized framework builds of 3.9 with the 
change (-a) and with the revert (-revert). It shows no change:

❯ ./python3.9 -m pyperf compare_to /Volumes/RAMDisk/py39*
2to3: Mean +- std dev: [py39-a] 724 ms +- 6 ms -> [py39-revert] 722 ms +- 2 ms: 
1.00x faster
fannkuch: Mean +- std dev: [py39-a] 1.26 sec +- 0.00 sec -> [py39-revert] 1.26 
sec +- 0.00 sec: 1.00x faster
float: Mean +- std dev: [py39-a] 320 ms +- 3 ms -> [py39-revert] 319 ms +- 1 
ms: 1.00x faster
go: Mean +- std dev: [py39-a] 726 ms +- 6 ms -> [py39-revert] 718 ms +- 4 ms: 
1.01x faster
hexiom: Mean +- std dev: [py39-a] 28.3 ms +- 0.3 ms -> [py39-revert] 28.1 ms +- 
0.3 ms: 1.00x faster
logging_format: Mean +- std dev: [py39-a] 22.5 us +- 0.3 us -> [py39-revert] 
22.4 us +- 0.2 us: 1.00x faster
nqueens: Mean +- std dev: [py39-a] 274 ms +- 2 ms -> [py39-revert] 273 ms +- 2 
ms: 1.00x faster
pickle_dict: Mean +- std dev: [py39-a] 57.4 us +- 0.6 us -> [py39-revert] 57.1 
us +- 0.7 us: 1.01x faster
pickle_pure_python: Mean +- std dev: [py39-a] 1.32 ms +- 0.02 ms -> 
[py39-revert] 1.31 ms +- 0.02 ms: 1.01x faster
pidigits: Mean +- std dev: [py39-a] 619 ms +- 0 ms -> [py39-revert] 614 ms +- 0 
ms: 1.01x faster
pyflate: Mean +- std dev: [py39-a] 2.02 sec +- 0.02 sec -> [py39-revert] 2.00 
sec +- 0.01 sec: 1.01x faster
python_startup: Mean +- std dev: [py39-a] 26.3 ms +- 0.1 ms -> [py39-revert] 
26.3 ms +- 0.1 ms: 1.00x slower
regex_dna: Mean +- std dev: [py39-a] 255 ms +- 2 ms -> [py39-revert] 250 ms +- 
1 ms: 1.02x faster
regex_effbot: Mean +- std dev: [py39-a] 6.23 ms +- 0.04 ms -> [py39-revert] 
6.18 ms +- 0.01 ms: 1.01x faster
regex_v8: Mean +- std dev: [py39-a] 43.5 ms +- 0.4 ms -> [py39-revert] 43.3 ms 
+- 0.1 ms: 1.01x faster
richards: Mean +- std dev: [py39-a] 228 ms +- 3 ms -> [py39-revert] 226 ms +- 3 
ms: 1.01x faster
spectral_norm: Mean +- std dev: [py39-a] 430 ms +- 4 ms -> [py39-revert] 429 ms 
+- 3 ms: 1.00x faster
sympy_expand: Mean +- std dev: [py39-a] 1.25 sec +- 0.01 sec -> [py39-revert] 
1.25 sec +- 0.01 sec: 1.00x slower
sympy_str: Mean +- std dev: [py39-a] 733 ms +- 7 ms -> [py39-revert] 729 ms +- 
6 ms: 1.01x faster
telco: Mean +- std dev: [py39-a] 16.6 ms +- 0.2 ms -> [py39-revert] 16.5 ms +- 
0.1 ms: 1.01x faster
unpack_sequence: Mean +- std dev: [py39-a] 238 ns +- 3 ns -> [py39-revert] 236 
ns +- 2 ns: 1.01x faster
unpickle: Mean +- std dev: [py39-a] 41.3 us +- 0.5 us -> [py39-revert] 41.1 us 
+- 0.5 us: 1.01x faster
unpickle_list: Mean +- std dev: [py39-a] 12.5 us +- 0.1 us -> [py39-revert] 
12.5 us +- 0.1 us: 1.01x slower

Benchmark hidden because not significant (35): chameleon, chaos, crypto_pyaes, 
deltablue, django_template, dulwich_log, json_dumps, json_loads, 
logging_silent, logging_simple, mako, meteor_contest, nbody, pathlib, pickle, 
pickle_list, python_startup_no_site, raytrace, regex_compile, scimark_fft, 
scimark_lu, scimark_monte_carlo, scimark_sor, scimark_sparse_mat_mult, 
sqlalchemy_declarative, sqlalchemy_imperative, sqlite_synth, sympy_integrate, 
sympy_sum, tornado_http, unpickle_pure_python, xml_etree_parse, 
xml_etree_iterparse, xml_etree_generate, xml_etree_process

Geometric mean: 1.00x faster

----------

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