Hehe, I tried PAC on my S3 a while back and it felt too 'heavy' in use and got sluggish over a few days use. Tried it once at the start of this year on the Find 5 iirc - and I weirdly had the same experience. It just had too much stuff going on that I personally didn't require, hence Omnirom being my main driver for quite a while.
.
hmm, might be the rom then! I'll install omni tonight and see if it's any better!