I have a T-mobile G3 and I didn't run ART for long. I think it did speed up my phone but my battery life suffered. I used it for a few days but finally went back to Dalvick because of the battery life and because some of my apps quit working on ART.
I second using Nova launcher. It made a difference for me
ART on my AT&T G3 increased my battery life by over 30%. It's weird how different it is on different carriers.
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