The only lag is in some of the GPU intensive applications like the Theme and LeWa Player and . I tried every single ROM in the IHO with the exception of the BobZohme ROM as it was too much like the magpie which LeWa didn't work on.
Harmonia and almost-purity where the only ones that allowed everything to actually work (after running fix_permission). The almost-purity with the MiRaGe Kernel (I tried every IHO kernel with each ROM as well) out performed the Harmonia. I've spent a huge amount of my time trying to make sure that the best Host ROM and kernel was used to minimize FC's and get the best performance at 480MHz-768MHz with the Smartassv2 or InteractiveX
Read post #107 the almost-purity/MiRaGe kernel combo is the best. All my downloaded apps are opening faster than ever before. The 3D Gallery actually worked better than designed (it's no longer a piece of junk) The scrolling is as smooth and fast as ICS. You just have to give it a little time for everything to come together. Every reboot it gets tighter and tighter. It takes a while for all the GPU intensive apps to settle in. Then the script tweaks this ROM has can really be felt.
If you follow the instructions I left in post #107 Everything will work as described. No other current ROM kernel combo will improve on it.
Do what you want, I just helped out a little, and got a pretty cool ROM out of the deal.
Tomorrow I really need to pull the links and edit the post down to "EDIT". I only got free download links until we got this testing and experimenting finished. I have 77 forums and sub-forums to manage. I have no more time, I'm behind.
I'm sure you will continue to find ways to improve on this ROM as new kernels and ROM updates avail themselves. There where some interesting ideas in Lovetz thread. You have to read through a lot of pages, but it is worth it. The first post has some good stuff in it, and needs to be checked every week if you can (The Chinese update LeWa once a week with something new and improved on their site).
I almost forgot: Don't install Beats Audio. It will bork a lot of things. It doesn't play well with this UI.