QUOTE(collin92 @ Apr 17 2015, 04:35 AM)
Yes, for my Lumia 530, the performances is VERY SLOW,
it feels like the responsiveness got a delay like for half a second.
Need to hold Back button for 1 sec, then App Lists appear with slow-zoom-out-animation.
(I just said to myself- they didnt install Snapdragon Driver Chipset yet, thats why the performances is not smooth

)
Some apps like People Hubs got to many "padding" (empty spaces) that will cover your screen contents
(Poor my 4 inch Lumia, can only see 2 contact names at a time during search).
Sometimes can screenshot, sometimes can't.
Sometimes can copy paste, sometimes can't.
New Photo Apps takes time to open because it's always "Searching for content".
Action Center become more useful, however I dislike Quick Actions Icons after "Expand", too messy.
Other Apps UI changed, for me, I love it.. (Messaging, People, Stopwatch, Timer, Calendar)
agree with those, however, i'm using it since win10TP coming out on my 1520,
the transition feels smoother from wp8.1,
some of the settings can't be access, i.e : glance screen.
all microsoft app were not auto update after a fresh start, even those here maps...
need to chase each app for manual update.
sudden heat up while idle.
really really hope the keep the swipe left and right gesture for changing mode in dialer, and all other things.