I sure I'm not the only who is experiencing this but when I unlock my phone I get this stutter, or when I it hit the home key to back to the home screen it does it most of the time
Now I have the note5 and gs7 edge and neither do this they need to address this **** not happy
1. Hard reset from recovery and clear the caches
2. When setting up again do not use SmartSwitch or let Google load all your apps at startup.
3. Set it up (before any software or syncing) and then test for the lag.
4. If still lag you have a phone issue.
5. If no lag start by adding your apps one at a time and check for lag.
6. Use SmartSwitch but don't let it load any apps. Do those manually.
As you load apps keep checking for lag. You may have a bad app. If you figure it out, try clearing the data and the cache for the app and see if that helps the lag.