I have run some ICS Roms from my favorite developers after installing the leak, and there is still lag between menu items in apps and settings screens for some reason. For example going to the bookmarks screen within the internet browsser takes a solid 3 seconds for me. I am on stock rooted ICS now, because it seems to be running the quickest so far. ICS has just never ran to optimum performance on my device. It's better after the leak, but their is lag still. I wonder if it is Sense.