FYI, Vanir Lollipop is also available for Jewel.
I think there should be a new thread here, but I don't feel right creating one. I don't deserve any credit since I didn't compile the ROM and am not involved in Vanir in any way.
http://www.emccann.net/nuclearmistake/VanirAOSPNightlies/jewel/
I didn't notice any lag yet, but the kernel is patched through 3.4.104 (as opposed to CM's 3.4.82) so it may have the same bug that seems to be in all of the other patched kernels, which makes the ROM abusively slow after a few days. (Not sure if it still does, but Dirty Unicorns kernel has this problem, as far as I know).
If you encounter this issue, you can extract the boot.img from any of the other jewel ROMs that are out there, and flash it via fastboot or using a program like Rashr. Alternatively you could flash one of my standalone kernel zips.
If you run the standard Vanir kernel and
don't have any issues with lag after a few days, please let me know!!! There's a lot of good stuff in those patches, and it's a shame that we can't currently take advantage of it.