Run results for: iframe vs window

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.106 Safari/537.36

Browser: Chrome 91

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Native	6617522.0 Ops/sec
Iframe	6914893.0 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