[Perf] improve performance by optimizing getId

[golopot]

Profiler shows it's about 2% faster overall.

[codecov]

Codecov Report

Merging #3451 (5baa3e0) into master (d0da6bf) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3451   +/-   ##
=======================================
  Coverage   97.62%   97.62%           
=======================================
  Files         123      123           
  Lines        8976     8976           
  Branches     3279     3279           
=======================================
  Hits         8763     8763           
  Misses        213      213           

Impacted Files	Coverage Δ
lib/util/Components.js	96.50% <100.00%> (ø)

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[ljharb]

We can do this in this case since it's inside an abstraction, but this kind of microoptimization is imo crossing the line to where the readability hit isn't worth the performance gain.

[golopot]

Good point.