[PR #9498/13dc020 backport][3.11] Improve performance of WebSocketReader

[bdraco]

(cherry picked from commit 13dc020)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.85%. Comparing base (50ad770) to head (1448640).
Report is 2 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #9502   +/-   ##
=======================================
  Coverage   97.85%   97.85%           
=======================================
  Files         106      106           
  Lines       35211    35215    +4     
  Branches     4227     4227           
=======================================
+ Hits        34455    34459    +4     
  Misses        564      564           
  Partials      192      192           

Flag	Coverage Δ
CI-GHA	97.73% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.42% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.85% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.12% <100.00%> (-0.01%)	⬇️
Py-3.10.11	96.98% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	96.92% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	97.00% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.07% <100.00%> (-0.01%)	⬇️
Py-3.12.7	97.46% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	97.45% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.90% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	96.84% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.45% <100.00%> (+<0.01%)	⬆️
VM-macos	97.12% <100.00%> (-0.01%)	⬇️
VM-ubuntu	97.42% <100.00%> (+<0.01%)	⬆️
VM-windows	94.85% <100.00%> (+<0.01%)	⬆️

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