How do you know without using the device? People who haven't even used the device are making this out to be some massive deal like the S4 is significantly slower across the board than other devices. It isn't. Does it need to be fixed? Sure. What I'm saying is that in the interim, there's a way to fix it if for whatever reason it bugs you. Its not like the entire UI is slow and moves at a snails pace. Theres a few animations that can be janky. Occasionally. Meaning not all the time.
No device is perfect. The vaunted HTC One has a plethora of issues that can't be fixed in 30 seconds in the settings menu. Again, its fine to point it out and want it fixed, but like every other thing about the S4, its being blown out of proportion by people who haven't even used the device.
Although this didn't play into my decision to exchange the One for this S4, I absolutely love how polarizing this phone is. So many people trying to give it less credit than it deserves, talking negatively about it, etc. Unfortunately, it'll still be the hottest selling and most talked about Android device of the year.
Sent from my Samsung Galaxy S4