(1) PS tool bar-'edit'-'prdfterence'-'function'
(2)Remove '√' of 'Usign the graphics processor'-click 'confirm'
(3)Brush toolbar-'brush'-'gear icon'-'reset tool'
Another reason for line lagging is a high value of 'flatness' you set.
Click 'brush tool'
Set the value to 10%. If the situation has not imporoved, please set to 5% to adjust.