Run results for: iframe vs window

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; Pixel 3a) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Mobile Safari/537.36

Browser: Chrome Mobile 86

Operating system: Android

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
Native	1470412.9 Ops/sec
Iframe	1465255.1 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