Install Nova Launcher and open the app drawer. Navigate to Nova Settings > App & widget drawers > Hide Apps. Select the apps you want to hide, and they won't show up on your app tray anymore. To reveal an app again, simply return to the same menu and uncheck the desired app.
Make sure you have the latest Google Play services and Google app installed on your device.
Change phones system language to English USA: The Google Assistant will roll out in phases, targeting its English speaking US users first so make sure you change your phones system language to English USA. Below is a quick guide on how to do this:
Go to Settings.
Select Language and Input.
Select Languages English (United States).
Youre now ready to get Google Assistant, just wait for it.
Hanging problem ? I am not facing any such issues. Try to update it to lastest available OS update and check if you have installed any buggy app which runs in the background. I had installed some app in past from different website rather than playstore. After that I was facing slower performance but when I uninstalled it then it started working smooth again.