To be honest I use code kernel with everything. I am running the latest nightly now with vanquish kitties n39 and the newest crossbreeder and it flies! I have even considered baking it in in the future.
well, your work/this ROM has never had any problem with performance.
my sole concern for using the custom kernel and cross breeder would be to get back the extra battery life that we lost by going to 4.2.2
however, that being said, with running just the 6/29 build (no custom kernel, no crossbreeder, no V3 script, no mod whatsoever), I am happy to report that I reached 1day+ on a single charge (with 2+ hours of on screen time).