el.setAttribute('dummy__1', 'foo', i);
          }
          const t1 = window.performance.now();
          console.log((t1 - t0) / 100000, 'ms');
        }
      });
    </script>
  </head>
  <body>
    <a-scene>
      <a-assets>
        <a-mixin id="foo" dummy__1="foo: 1"></a-mixin>
        <a-mixin id="bar" dummy__1="foo: 2"></a-mixin>
        <a-mixin id="baz" dummy__1="foo: 3"></a-mixin>
      </a-assets>

      <a-entity mixin="foo bar baz" dummy__1="a: false; b: false; c: false; d: false; e: false; f