Shorten scope lookup

JavaScript performance comparison

Test case created

Preparation code

<script>
  (function() {
   window.a = function() {
    window.aa = 1;
   };
  })(window);
 
  (function(window) {
   window.b = function() {
    window.bb = 1;
   };
  })(window);
</script>

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Testing in unknown unknown
Test Ops/sec
Don't copy window
a();
pending…
Copy window
b();
pending…

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