[PR #9498/13dc020 backport][3.10] 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 97.82%. Comparing base (56572b3) to head (3095e5a).
Report is 1 commits behind head on 3.10.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #9501   +/-   ##
=======================================
  Coverage   97.82%   97.82%           
=======================================
  Files         106      106           
  Lines       35065    35069    +4     
  Branches     4220     4220           
=======================================
+ Hits        34302    34306    +4     
  Misses        568      568           
  Partials      195      195           

Flag	Coverage Δ
CI-GHA	97.71% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.40% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.93% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.09% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	96.95% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	96.89% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	96.97% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.04% <100.00%> (+<0.01%)	⬆️
Py-3.12.7	97.43% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	97.42% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	94.32% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	96.68% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.86% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	96.80% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.41% <100.00%> (+<0.01%)	⬆️
VM-macos	97.09% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.40% <100.00%> (+<0.01%)	⬆️
VM-windows	94.93% <100.00%> (+<0.01%)	⬆️

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