several things can cause lag, even my 2K macbook can lag ever now and than, clearing ram might help, restarting might help, as long as its not lagging 24/7
I have found a few poorly written live wallpapers. Try switching to another one and see if that helps. If it does contact the author and ask them to write better code.
The stock launcher is touchwiz but you can download others such as go, apex, adw, nova, etc from the play store. If it's the same on all then it's probably a dodgy wallpaper as said above.
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