When I ran my S4 with a GPE ROM it was quick, just not as quick as the Nexus 5. The S4 just seemed to lag more than the N5 does. The GPE is smoother than a regular S4 but by not that much. I ended up giving my S4 to my wife so I can get the N5. The N5 just feels quicker and smoother. I feel it has to be the graphics card.
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