![]() ![]() ![]() The why is quite simple to understand: the faster a page is able to fully render, the quicker all components can drive down to their idle power states. Our 5th generation web browsing battery life test should map well to more types of smartphone usage, not just idle content consumption of data from web pages.Īs always we test across multiple air interfaces (3G, 4G LTE, WiFi), but due to the increased network load we actually find that on a given process technology we see an increase in battery life on faster network connections. Everything you do on your smartphone ends up causing CPU usage peaks - opening applications, navigating around the OS and of course using apps themselves. The end result is a CPU usage profile that mimics constant, heavy usage beyond just web browsing. We also increased CPU workload along two vectors: we decreased pause time between web page loads and we shifted to full desktop web pages, some of which are very js heavy. Brian made sure that despite the increased network load, the baseband still had the opportunity to enter its idle state during the course of the benchmark. Some caching is important otherwise you end up with a baseband test, but it's clear what we had previously wasn't working. On the network side, we've done a lot more to prevent aggressive browser caching of our web pages. The differences between this test and our previous one boil down to the amount of network activity and CPU load. The premise is the same: we regularly load web pages at a fixed interval until the battery dies (all displays are calibrated to 200 nits as always). After testing a number of options (and using about 16.5GB of cellular data in the process) we ended up on an evolution of the battery life test we deployed last year for our new tablet suite. Going into the iPhone 5 review I knew we needed to change the suite. The data was accurate, but stopped being representative of reality. The data on the previous page showed just how good Apple is at driving down idle power consumption, and through some software optimization it got very good at winning in our battery life tests. The Mac suite has evolved over time, and we've made similar evolutions to the smartphone suite - just on a less aggressive pace. The first incarnation of our smartphone battery life suite was actually a port of what I created to test battery life on Mac notebooks years ago. At the start of our iPhone 4S battery life analysis I mentioned that I wasn't happy with the current state of our battery life benchmarks. ![]()
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