Soo today I connected my samsung c24fg70 (23",1080p,144hz,1ms,curved) monitor to my Asus UX303L(13",940M) using a new hdmi cable, I realised very soon that the image on the monitor is worse than the laptop one(just notable not a big difference).
I'm using both devices simultaneusly and the image is doubled on my 23"monitor from the 13" monitor I think this is the issue maybe coming from a 13" to a 23" monitor ruins the image.
PS:I already checked both resolution(1080 and 1080) and I tryed to use only the second monitor disabling the first but nothing changes.