While your test is exactly what is expected from iPhones, it says nothing about their performance on other devices.
Chrome and Firefox on the iPhone are not the same Chrome and Firefox found on desktop and android devices. Apple restricts apps that provide web browsing to use old and outdated versions of the native IOS rendering engine and JavaScript engine.
Chrome and Firefox on the iPhone are not the same Chrome and Firefox found on desktop and android devices. Apple restricts apps that provide web browsing to use old and outdated versions of the native IOS rendering engine and JavaScript engine.
http://www.howtogeek.com/184283/why-third-party-browsers-wil...