I tapped Safari, the icon darkened and it took three seconds before the opening animation even occurred. That was on a clean install.
I opened the mail app, which disappeared so I was starting at my wallpaper even after I force quit it 3 times.
I can type a good three sentences on an unresponsive keyboard before anything shows up.
Safari often freezes on a white screen when scrolling and switching tabs results in a white screen until the site pops up.
After I double click the home butter or use the four finger gesture there is about a 2 second delay before the app switcher activates and the animation is usually completely absent because of the lag.
I can deal with the Safari UI lag, but it is loading webpages noticeably slower. And every time I try to delete something from reading list I get "Bookmarks are synching".