Optimise decompression size (#12357)

[Dreamsorcerer]

(cherry picked from commit 53f6e91)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.20%. Comparing base (5c17b64) to head (fb3c822).
⚠️ Report is 1 commits behind head on 3.14.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.14   #12391   +/-   ##
=======================================
  Coverage   98.19%   98.20%           
=======================================
  Files         135      135           
  Lines       47104    47121   +17     
  Branches     2521     2525    +4     
=======================================
+ Hits        46256    46273   +17     
  Misses        671      671           
  Partials      177      177           

Flag	Coverage Δ
CI-GHA	98.26% <100.00%> (+<0.01%)	⬆️
OS-Linux	98.02% <100.00%> (+<0.01%)	⬆️
OS-Windows	95.66% <90.62%> (-0.01%)	⬇️
OS-macOS	97.20% <90.62%> (-0.01%)	⬇️
Py-3.10.11	96.69% <90.62%> (-0.01%)	⬇️
Py-3.10.20	97.16% <90.62%> (-0.01%)	⬇️
Py-3.11.15	97.45% <90.62%> (-0.01%)	⬇️
Py-3.11.9	96.98% <90.62%> (-0.01%)	⬇️
Py-3.12.10	97.06% <90.62%> (-0.01%)	⬇️
Py-3.12.13	97.54% <90.62%> (+<0.01%)	⬆️
Py-3.13.12	?
Py-3.13.13	97.76% <90.62%> (+2.48%)	⬆️
Py-3.14.3	?
Py-3.14.4	97.81% <90.62%> (?)
Py-3.14.4t	96.84% <90.62%> (-0.01%)	⬇️
Py-pypy3.11.15-7.3.21	96.67% <90.62%> (-0.01%)	⬇️
VM-macos	97.20% <90.62%> (-0.01%)	⬇️
VM-ubuntu	98.02% <100.00%> (+<0.01%)	⬆️
VM-windows	95.66% <90.62%> (-0.01%)	⬇️
cython-coverage	38.09% <75.00%> (+0.02%)	⬆️

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[codspeed-hq]

Merging this PR will degrade performance by 12.73%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 4 improved benchmarks
❌ 1 (👁 1) regressed benchmark
✅ 62 untouched benchmarks
⏩ 4 skipped benchmarks¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	test_get_request_with_251308_compressed_chunked_payload[zlib_ng.zlib_ng-pyloop]	244.6 ms	216.3 ms	+13.08%
⚡	test_get_request_with_251308_compressed_chunked_payload[isal.isal_zlib-pyloop]	114 ms	73 ms	+56.18%
👁	test_ten_compressed_responses_iter_chunked_1mb[zlib_ng.zlib_ng-pyloop]	55.6 ms	63.7 ms	-12.73%
⚡	test_read_compressed_post_body[isal.isal_zlib-pyloop]	34.5 ms	29.6 ms	+16.7%
⚡	test_read_compressed_post_body[zlib-pyloop]	47.2 ms	40.4 ms	+16.76%

---

_{Comparing patchback/backports/3.14/53f6e919dbae7b65627018f015014e0fe70b4d92/pr-12357 (fb3c822) with 3.14 (5c17b64)}

Footnotes

1. 4 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩