The Android 4.3 system dump for the Nexus 4 from yesterday is still not perfectly ready for daily use, but it’s now much easier to install. You can follow instructions here to flash it (using any recovery) to your Nexus 4, it shouldn’t delete your data (once again, proceed at your own risk and do a backup for peace of mind).
Why would you risk it when the official update could be just days away? Android 4.3 brings few changes over 4.2.2, but they are important – and better performance is seemingly one of them.
Native performance is virtually unchanged (as measure by CFBench), but that’s hardly a surprise. The Dalvik VM has been retooled and apps that don’t use the NDK (that’s the majority of them) should see a performance bump.
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Android 4.3 supports OpenGL ES 3.0 and seems to include other changes to the graphics stack as 3D performance in GLBenchmark 2.5 has gone up by several frames in both on and off screen tests. It’s a pretty big difference indeed, but developers will also have to do their part and take advantage of it.
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Other changes in v4.3 are Bluetooth 4.0 support (until now makers had to roll their own), AVRCP 1.3 support for Bluetooth (basically when you play a song over BT, the phone will transfer artist and song info to the player), T9 in the dialer, new Camera, Gallery and Play Store apps plus the Google Keep app.