Originally Posted by elemary
Any boooody say something
Custom ROM is simply slightly or much tweaked Stock ROM. It can contain themes or new functionality, added or removed apps etc. Most of the Custom Touchiz ROMs are pretty similar to stock ROMs and have added bits and pieces that most people would add anyway - like Xposed framework and some Xposed modules, etc, sound enhancements, Note 3 software but still look much like Stock Samsung ROM.
After 4.1.2 I flashed Criskelo (Custom TW ROM) and it is smoother than 4.1.2. I am very satisfied with this ROM, and can't understand why so many people complain about 4.3. IMHO this is the single BEST update on android I had on any device ever. 1st time I can really tell it is smoother than the previous version.
I strongly reccomend updating to 4.3, just follow all instructions and you should be fine. IMHO best ROMs are DN3, Phoenix and Criskelo. You can also try pre-rooted de-Knoxed stock ROMs, but you would loose any of the extras in these ROMs (Note 3 sw etc).