small performance improvements for ServiceLocator

[304NotModified]

Fixes #134

[codecov]

Codecov Report

Merging #141 into master will decrease coverage by 0.58%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
- Coverage   62.83%   62.24%   -0.59%     
==========================================
  Files          26       26              
  Lines         339      339              
  Branches       81       81              
==========================================
- Hits          213      211       -2     
  Misses         91       91              
- Partials       35       37       +2

Impacted Files	Coverage Δ
...etCore/LayoutRenderers/AspNetLayoutRendererBase.cs	87.5% <ø> (ø)	⬆️
...e/LayoutRenderers/IISInstanceNameLayoutRenderer.cs	0% <ø> (ø)	⬆️
...youtRenderers/AspNetRequestCookieLayoutRenderer.cs	80.76% <0%> (-3.85%)	⬇️
...outRenderers/AspNetLayoutMultiValueRendererBase.cs	95.12% <0%> (-2.44%)	⬇️

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