Prepare Yourself & Your Device
The Android 6.0 Marshmallow comes with a ton of new features and there's a good chance it will have a positive impact on your device's performance and your experience with Android. There's also a chance things could be the exact opposite. That's why you should prepare for the update, it could help you limit problems.
We've put together a guide that will take you through the pre-installation process. These are the steps we take before every Android update and they've helped us get through most Android upgrades unscathed. They could help you so take a look.