My Mi Mix was running the latest MIUI 9.6 (oreo) global stable and everything was 'snappy' and very responsive. I installed TWRP, formatted and cleaned everything and flashed MIUI 10 eu.xiaomi (8.7.19), and now I have a delay or lag opening apps. My email app, for example, Blue Mail, opens to an all white screen for about 8 seconds before loading. Even waking up the phone shows a dark lock screen which gradually brightens up but you can't see the lock screen picture clearly in the 5 + seconds it takes to swipe up to unlock. Before the phone woke up to a bright lock screen image. Also, with MIUI 9 once you swiped up on the lock screen the phone opened to its home screen with all icons. Now it opens to a blank home screen (just the wallpaper) and the icons load 10 seconds later. Is this a problem with the MIUI 10 dev builds generally or just this most recent build?