Default MK2 update and wake from sleep lag plus flickering screen issue

Hello everyone,

I am having an issue with wake up lag on pressing the power key or the home key. Never had this issue with 4.2 but I have this issue on every 4.3 MK2 ROM I have tried. I have done full wipe, sd wipe, before flashing ROMs but no luck. I also noticed the screen flickers sometimes. The issue with wake up lag is really annoying as after waking up the apps respond really slowly. I am still knox free so not sure if this is related to that.

Anyone else with these issues and possible fixes? Thanks.
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