Hello just changed from s3 to s4 but some games like clumsy ninja runs slow on s4 feels like underwater or on low gravity! But on weaker s3 it worked fine... Maybe is way to fix it? Also mkx game loves to slow down on s4 so much ram power but slowdown games? HELP =)
Root your phone and use some Android Tweaker. Look for tweak (because you want to have good games perfomance) Low Memory Killer. Highest Value should be 256MB. Best app for you is here: MinFreeManager For games set to Agressive!