When a first upgraded, the OS was slow and hanging a lot in loading screens
Cortana was working, but laggy and she didn't speak at all
Tiles with small icons and background in low resolution
People Hub crashing when i tried to put contacts in the inner circle
New Lockscreen was beautifull, but laggy and messed up
Tried to sync my office 365 account in mail, error
Then i decided to do a hard reset and now cortana crash when i try to open, backgroung still lame. BUT, the lag and loading screen are ok now