Im on Tmobile. Just released it today!
Just for the couple minor things....Like changing the 4x4 to what ever(5x5,7x7).....
I having experienced much in the way of lag at all really. Im rooted and cleaned up shop a bit and optimized some things. But even before that, lag wasnt an issue.
One thing i did find though is that when your in one handed key boardmode, your supposed to be able to pinch zoom and it makes the keyoard big again....but it doesnt....I dunno....
Cool thanks for the info. Just an FYI I use Nova Launcher on my rooted S4 just because I like to take away the dock and I feel it is a bit snappier. But there is a setting that will let you resize any widget on the home screen. Just something to maybe try until ROMs come out.