Lag when multitasking?

[mikeyv2009]

I love my s4 hasn't done me wrong yet but I noticed while I was updating some apps in the play store that my phone began to have some pretty good lag once I started playing granny smith.. Is that normal for this phone to lag when updating apps and playing a game? Doesn't it supposedly have one of the best processors and hardware out right now or is that even to much for this phone to handle?

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