It's perhaps not so much the UI that is slow, it's the E Ink display that does not respond as fast as the screens of tablets or computers. Of course there are differences between readers, for example because some have a better processor than others, and the responsiveness of the firmware as such may vary, but you may experience all E Ink readers as slow and chunky.
I have a PocketBook Touch Lux 2 (so not a 3), and for me the speed of the UI is quite acceptable. But I do not have a Kindle to compare it with.
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