Huh? Safari is so much better than Chrome or IE on mobile right now it's humiliating for Android & Windows, guys. It's literally over twice as fast.
I'm going to quote some benchmarks, but even these don't tell the real story, because Apple's advantage isn't so much how much faster and more capable Safari is at all of these synthetic benchmarks for a browser app's performance in the various ways that it is normally challenged, but because of the incredible amount of optimization from website developers themselves for the iOS platform (sometimes including optimization for Apple on a freaking per-device level).
http://hothardware.com/news/samsung-galaxy-s7-versus-iphone-6s-plus
JetStream is the replacement follow-on benchmark to SunSpider and it focuses on browser performance as well as javascript processing. Here we're seeing an outlier and it looks like the Galaxy S7's software setup needs a bit of optimization. Apple's iPhone 6S Plus smokes all contenders by a wide margin as well, suggesting great efficiency in their software stack.
Rightware's BrowserMark test ranks performance of modern mobile web browsers, along with device processing engines, in terms of how well they handle web page loading, screen resizing, and web graphics rendering workloads. In this test, the Samsung Galaxy S7 just edges out the Snapdragon 810 octal-core equipped Google Nexus 6P and the iPhone 6S but is surpassed by the octal-core Kirin 950 by a small 5% margin. And again, it's impressive to see how the Apple A9 and Snapdragon 820, with 2 and 4 cores respectively, compete versus the octal-core chips. Performance scaling per core certainly isn't linear.
Update 3/11/2016: We have since refresh Samsung's previous generation Galaxy S6 Edge and Edge+ numbers here and have updated the chart. It was determined the previous scores had anomalies and the new scores show the octal-core Exynos-power GS6 series scores quite well in this test.
You will probably notice the
iPhone 6s Plus and
iPhone 7 aren't on the below chart. That's because the latest version of Safari wasn't compatible with the benchmark upon release of the
iPhone 6s models. Nevertheless, you can see at the bottom of this page that
2014's iPhone 6 and
iPhone 6 Plus are still vastly superior to the latest
Samsung Galaxy S7 release:
http://www.gsmarena.com/apple_iphone_6_plus-review-1142p5.php
Finally, you have Javascript benchmark Kraken. I'm not seeing it tested for the most recent Samsung releases, but it has trailed Apple by even more than it does in the Browsermark for past releases:
http://www.gsmarena.com/apple_iphone_6s_plus-review-1316p6.php