This is by far my favorite rom for the Nexus 5. Here is a quick description:
“PSX is a fast, built from AOSP source (4.4_r1.1) Rom with an emphasis on speed and performance. Our goal is to provide unrivaled performance, stability, and a lightweight Rom with a handful of valuable features. We are not, nor ever will be focused on adding every feature out there. We will always be searching for ways to make it faster, more stable, more secure, and feature rich, but never at the cost of performance.”
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Rom and How To Install: http://forum.xda-developers.com/showthread.php?t=2532518