Balanced - This test is balanced between different areas of the language and different types of code. It's not all math, all string processing, or all timing simple loops. In addition to having tests in many categories, the individual tests were balanced to take similar amounts of time on currently shipping versions of popular browsers.
Statistically Sound - One of the challenges of benchmarking is knowing how much noise you have in your measurements. This benchmark runs each test multiple times and determines an error range (technically, a 95% confidence interval). In addition, in comparison mode it tells you if you have enough data to determine if the difference is statistically significant.
We're still building up reference data for the newest version of SunSpider, so we ran both v0.9.1 and v1.0.2 here. As you can see, the Nexus 6 returned relatively similar results in both versions of the test. In the past, we’ve noticed that the Chrome browser is typically slower than other browsers in this test. Since Chrome is the only browser that comes preloaded on the Nexus 6, we weren’t surprised to see scores that were middle-of-the road.
Rightware recently updated the BrowserMark benchmark to a version 2.1. Scores are not compatible with previous versions. For the sake of comparison, we ran the previous version of the BrowserMark benchmark. Using version 2.0, you’ll find the Nexus 6 in fourth place behind the Note 4, Galaxy S5 Sport, and iPhone 5S.