My Dell 27" (2015) monitor takes about 10 to 15 seconds to wake up after powersave mode which it turns on in about 1 second after I lock my MacBook. Annoying a

My Dell 27" (2015) monitor takes about 10 to 15 seconds to wake up after powersave mode which it turns on in about 1 second after I lock my MacBook. Annoying as hell. Maybe someone could suggest me a fix?