Here are some tips and tricks you can follow to fix the Galaxy S4 freezing and lagging.
- Experts agree that a few apps like bloatware are responsible for the TouchWiz to freeze sometimes. Disabling useless apps should help. Follow these steps: Settings> More> Applications Manager> All> select apps> Disable.
- Clearing up your application cache frees up memory, and removes temporary files. Your personal settings and files will not be affected by clearing up app cache. From the home screen, touch Apps. Scroll to and touch Settings. Touch More. Touch Application manager. Swipe left to view the All tab. Scroll and touch the preferred application. Touch Clear cache. Then you are done.
Watch this video to get rid of Lag and speed up the Galaxy S4 by 10 times Nova Launcher Some say that installing the Nova launcher, greatly improves speed and gets rid of lag.