Every brand seems to have that Achilles heal atm. Fortunately for Samsung and Android users Rooting is relatively easy to do if they choose, or they can even just use a different launcher. However I run Touchwiz and have not experienced the lag issues yet. It could just be I am not as picky. However I almost always eventually root and go to a different launcher.
There is no root for the Verizon or AT&T gs5 and that absolutely sucks. Even if/when one becomes available that doesn't guarantee s-off, which according to what I was reading on XDA and Twitter that probably won't happen on those versions.
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