CM is horribly slow on the Nexus 5 to be honest. I'm using Mahdi, it's the most complete and smooth custom ROM I've tried so far. It has a theme chooser too. Couple it with ElementalX kernel, and you get one beast of a phone.
You haven't tried DU then. Fastest ROM on the Hammerhead, easily (w/o custom kernel too). However, I'm a little biased.
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