perf: optimize one element splice operation

[tsctx]

Reopening #2718. It was closed by mistake.

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (e39a632) 85.54% compared to head (926a0c3) 85.60%.
Report is 334 commits behind head on main.

Files	Patch %	Lines
lib/web/cache/cache.js	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2809      +/-   ##
==========================================
+ Coverage   85.54%   85.60%   +0.05%     
==========================================
  Files          76       87      +11     
  Lines        6858     7706     +848     
==========================================
+ Hits         5867     6597     +730     
- Misses        991     1109     +118     

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[ronag]

This is way too micro optimization.

[tsctx]

Ah. I see.