Now i dont know if any of you have this problem, i havent read about it anywhere else i think. i'm using lollipop in my n5, i had this issue with stock lollipop and now also on xtrasmooth.
the problem was, that after unlocking the device by swiping up, there was a considerable lag between you seeing your homescreen and being able to interact with the app icons you have on it. The home, back and taskswitcher button are not affected by this. what i could do it unlock the device and instantly start tapping on the screen where an app shortcut it. it would take nearly 1 second of continous tapping until the app shortcut reacted. same for swiping - after unlocking i instantly start swiping left and right, but it took nearly 1 second until i get a reaction. the screen just wouldnt react to any input for a second.
i was just randomly changing settings in the developer options. i found that the animator duration scale is the culprit for this. set if to "off" and the lag is gone completely.
i have it set to .5 now and its ok. i suppose there still is a lag with .5, but its so short you wont really notice.
had it on 1 and 2 before which will give you a noticable lag. setting it to 10 will give you (well, me at least) a lag of nearly 4-5 seconds until the screen responses after unlocking.
alright, i just wanted to share this in case any of you have the same issue.
TL;DR: try setting the animator duration scale to a lower value if you have a lag after unlocking your device.
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