Use mypyc to compile websocket reader

[Dreamsorcerer]

No description provided.

[codspeed-hq]

Merging this PR will degrade performance by 30.25%

⚠️ 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

❌ 1 regressed benchmark
✅ 95 untouched benchmarks
⏩ 83 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	test_read_one_hundred_masked_large_binary_websocket_messages	60.2 ms	86.2 ms	-30.25%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing mypyc (b7a5c9e) with master (20acdf4)}

Footnotes

1. 83 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. ↩

[codecov]

Codecov Report

❌ Patch coverage is 98.85387% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.02%. Comparing base (20acdf4) to head (b7a5c9e).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
aiohttp/_websocket/reader.py	98.73%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #13559   +/-   ##
=======================================
  Coverage   99.02%   99.02%           
=======================================
  Files         135      136    +1     
  Lines       50500    50528   +28     
  Branches     2652     2652           
=======================================
+ Hits        50007    50035   +28     
  Misses        370      370           
  Partials      123      123           

Flag	Coverage Δ
Autobahn	21.94% <5.44%> (-0.10%)	⬇️
CI-GHA	98.91% <98.56%> (+<0.01%)	⬆️
OS-Linux	98.69% <98.56%> (+<0.01%)	⬆️
OS-Windows	96.96% <7.44%> (-0.13%)	⬇️
OS-macOS	97.85% <7.44%> (-0.12%)	⬇️
Py-3.10	98.11% <98.56%> (+<0.01%)	⬆️
Py-3.11	98.35% <98.56%> (+<0.01%)	⬆️
Py-3.12	98.43% <98.56%> (+<0.01%)	⬆️
Py-3.13	98.42% <98.56%> (+0.02%)	⬆️
Py-3.14	98.45% <98.56%> (-0.01%)	⬇️
Py-3.14t	97.48% <7.44%> (-0.13%)	⬇️
Py-pypy-3.11	97.42% <98.56%> (+0.02%)	⬆️
VM-macos	97.85% <7.44%> (-0.12%)	⬇️
VM-ubuntu	98.69% <98.56%> (+<0.01%)	⬆️
VM-windows	96.96% <7.44%> (-0.13%)	⬇️
cython-coverage	81.89% <7.18%> (-1.19%)	⬇️

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[Dreamsorcerer]

This is resulting in GBs of memory use, while removing it is resulting in numerous segfaults. Do not merge until this is fixed.