If you consider where Android was when it started versus how far it's advanced in 18 months with Android 2.2, you might get brain freeze.
Android 2.2—aka Froyo—is the most usable, polished iteration of Android yet. But more importantly, it's the first release that makes Android truly compelling for a broad consumer audience. Froyo's updates aren't that radical, but serious under-the-hood improvements and refinements throughout make it tangibly more pleasing to use.
Need for Speed
Without getting overly technical, Android executes its apps in a layer above its core Linux OS in a virtual machine called Dalvik. One of the major under-the-hood changes in 2.2 is a just-in-time compiler for Dalvik, which—here come the chocolate sprinkles—results in a 2x–5x performance boost for CPU-heavy code. That means faster apps—faster everything. (Google demoed it last week with the game Replica Island, which kept a higher framerate while doing more stuff in 2.2 compared to its performance on Android 2.1)
In everyday use, the new compiler combined with Android's efficient memory management means that pretty much everything you do, in both the general OS as well as apps, feels more responsive. The speed increase itself isn't staggering in and of itself, but the subconscious effects of a smoother, less draggy experience are real. The slowdowns and stutters I've come to just expect from Android (even with beefier processors) are mostly gone. And after a year-and-a-half of dealing with them, it's kind of remarkable to no longer rage at Android's persistent lagging.
According to Google, this speed boost incongruously comes with slightly better battery life. But any power improvements haven't been dramatic enough for us to notice during tests on the Nexus One.
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