[Q] i got some touchscreen problem on sony xperia sp

hi. it's my first post

i have little problem with my touchscreen

my touchscreen respond is slow when i use two finger (but no problem with 1 finger,smooth like i drop an oil on its :)

it take 1 second to respond

how to fix this problem ?

my phone is running on Pac Man Rom 4.4.4 on Sony Xperia SP

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