Recommend a stable and speedy ROM for someone who doesn't want to mess around.

Stock 5.1.1 recently flashed onto my n7 2012 after a while of not playing around with all the custom ROMs. About a year because my Nexus 5 took over as daily driver.

Now I'd like to use it again, what ROM would you suggest that is the most stable and fastest? No need for the extra frills.