halp halp!

hi guys I have a question for you who have some knowledge about computers (I don't have so^^)

I have a laptop (I think pretty good one, i5 cpu etc) and ofc I play ET on it.. I know desktop is better but for university I needed a good laptop and my desktop was very old..

but when I play, with laptopscreen, I have 125 fps stable everywhere.. But somehow ET is still running quite shocky sometimes.. Now I was thinking this is because of the 60hz the laptop only can handle..

I have this iiyama master vision pro 540 crt wich can go op to 120 hz.. Is this np for the laptop ?

Thanks :D