chromium/src/third_party/blink/perf_tests/bindings/typed-array-construct-from-same-type.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 <body>
 <script src="../resources/runner.js"></script>
 <script>

 var length = 1000000;
 var source = new Uint8Array(length);
 for (var i = 0; i < length; i++)
     source[i] = i;

 PerfTestRunner.measureRunsPerSecond({
     description: "Measures performance of creating a Uint8Array from an existing Uint8Array.",
     run: function() {
         var target = new Uint8Array(source);
     }
 });
 </script>
 </body>
	<!DOCTYPE html>
	<body>
	<script src="../resources/runner.js"></script>
	<script>

	var length = 1000000;
	var source = new Uint8Array(length);
	for (var i = 0; i < length; i++)
	source[i] = i;

	PerfTestRunner.measureRunsPerSecond({
	description: "Measures performance of creating a Uint8Array from an existing Uint8Array.",
	run: function() {
	var target = new Uint8Array(source);
	}
	});
	</script>
	</body>