Yes the contacts and dialer is become REALLY UNUSABLE and FRUSTRATING to use after the MiUI 9.x update. Done everything suggested here - no improvement. When you want to find and call someone urgent - the entire thing blanks out without any results and tests your patience. At times when you do get the person to call in the searched list - on opening the person - the contact details appear blank - after infinite tries - you do get it right in between - but really become pathetic to use. Urgent correction expected.