My external monitor for my laptop has input lag. HELP!

[LowBudgetPork]

i have a legion y540 icore 5 rtx 2060 144hz and it had no noticeable input lag playing fps games

 

 

 

then i bought a benq zowie xl2411p 144 hz. When i connected my monitor and close my laptop lid, i can feel input lag, my monitor settings are optimal. if i have both open they both have input lag. when I play games like minecraft and non competitive games the input doesnt affect gameplay because i dont have to aim. my connection is mini display port to display port using a triple adapter. any help is needed plz or else my monitor was  a waste of money sry for bad english ask any questions thanks.