Run results for: iframe vs window

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36

Browser: Chrome 84

Operating system: Mac OS X 10.15.4

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Native	5126344.0 Ops/sec
Iframe	5113274.5 Ops/sec

Script Preparation code:

var iframe = document.createElement("iframe");
iframe.src = "about:blank";
document.documentElement.appendChild(iframe);
var _window = iframe.contentWindow;
var iframeSplit = _window.String.prototype.split;
var split = String.prototype.split;
document.documentElement.removeChild(iframe);

Tests:

Native
split.call("a_random_string_test", "");
Iframe
iframeSplit.call("a_random_string_test", "");

Run results for: iframe vs window

Native

Iframe