Before you rush off to flash the first Android N developer preview, you may want to read through the list of known issues that Google has published. Some important ones seem to be. . . - System and app performance is known to be periodically slow / janky, and device may become occasionally unresponsive. These problems may become more acute with prolonged use. - Battery life may be regressed in this release for screen-on and screen-off use cases. - Voicemail playback does not work. - In the Gmail app, direct archiving of emails included in a notification bundle does not work properly. - Video playback may lag and show interruptions.