The device is already buttery smooth. I have not seen threads complaining about lag in terms of animations but one guy. It basically had to do with google launchers and the amount of widgets that he could place which was an ungodly amount. He was basically upset that his device only lags when he cycles through his widgets. Things that make you go hmmmm... but whatever
Don't get me wrong those dev guys at CM do a great job bringing old phones up to speed and supporting a lot of devices but in reality it is just another ROM that everyone knows about and I am not personally a fan of.
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