[PR #8847/6d974274 backport][3.11] Improve performance of handling skip_auto_headers

[patchback]

This is a backport of PR #8847 as merged into master (6d97427).

What do these changes do?

Most of the time there are no auto_headers

Are there changes in behavior for the user?

no

Is it a substantial burden for the maintainers to support this?

no

before

after

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.70%. Comparing base (68629b5) to head (5da56f0).
Report is 583 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #8905   +/-   ##
=======================================
  Coverage   97.70%   97.70%           
=======================================
  Files         108      108           
  Lines       34208    34209    +1     
  Branches     4063     4063           
=======================================
+ Hits        33424    33425    +1     
  Misses        586      586           
  Partials      198      198           

Flag	Coverage Δ
CI-GHA	97.60% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.28% <100.00%> (-0.01%)	⬇️
OS-Windows	94.83% <100.00%> (+<0.01%)	⬆️
OS-macOS	96.97% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.05% <100.00%> (+<0.01%)	⬆️
Py-3.10.14	96.99% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.22% <100.00%> (+<0.01%)	⬆️
Py-3.12.4	94.63% <100.00%> (+<0.01%)	⬆️
Py-3.12.5	97.02% <100.00%> (-0.01%)	⬇️
Py-3.9.13	96.96% <100.00%> (+<0.01%)	⬆️
Py-3.9.19	96.89% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.16	96.49% <100.00%> (+<0.01%)	⬆️
VM-macos	96.97% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.28% <100.00%> (-0.01%)	⬇️
VM-windows	94.83% <100.00%> (+<0.01%)	⬆️

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