[PR #8736/1b88af2 backport][3.10] Improve performance of WebSocketReader

[bdraco]

(cherry picked from commit 1b88af2)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.69%. Comparing base (dba2605) to head (b5ba2c7).
Report is 1 commits behind head on 3.10.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #8743   +/-   ##
=======================================
  Coverage   97.69%   97.69%           
=======================================
  Files         108      108           
  Lines       34164    34167    +3     
  Branches     4063     4064    +1     
=======================================
+ Hits        33378    33381    +3     
  Misses        587      587           
  Partials      199      199           

Flag	Coverage Δ
CI-GHA	97.59% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.27% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.79% <98.07%> (-0.01%)	⬇️
OS-macOS	96.93% <98.07%> (+<0.01%)	⬆️
Py-3.10.11	97.02% <98.07%> (-0.01%)	⬇️
Py-3.10.14	96.97% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.21% <100.00%> (+0.09%)	⬆️
Py-3.12.4	97.30% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	94.43% <94.23%> (-0.02%)	⬇️
Py-3.8.18	96.78% <96.15%> (-0.01%)	⬇️
Py-3.9.13	96.92% <94.23%> (-0.02%)	⬇️
Py-3.9.19	96.88% <96.15%> (-0.01%)	⬇️
Py-pypy7.3.16	96.47% <96.15%> (-0.01%)	⬇️
VM-macos	96.93% <98.07%> (+<0.01%)	⬆️
VM-ubuntu	97.27% <100.00%> (+<0.01%)	⬆️
VM-windows	94.79% <98.07%> (-0.01%)	⬇️

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