I just recently installed Crombi-x, and was pleased with the results for a bit, until, for some reason, it started getting buggy and slowed down. Tried to install Crombi-kk, failed, wiped, restored then rebooted into Crombi-x, and it's beastly fast again. I think using the stock ASUS launcher helps, but it may just be.
Any thoughts on why the same ROM would be faster the second time around? I think the v10 kernel is the only change I made.... Would that really make such a huge difference?
(I know this is all straight up speculation, but work with me here, it's Saturday, and I'm bored)