We can't flash the gpe rom as yet. At least you can but there is no wifi. There are a couple of Threads about it on these forums.
I'm surprised you have lag on cm11 as I don't recall encountering lag when I was on it (I was on it for about two months)
I'm currently on Infecteds cm11 which I'm really liking. So you can either try that or one of the others. Mahdi is also very stable.
All the best rich
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"It's psychosomatic. You need a lobotomy. I'll get a saw."