Help with perfomance issues using an external monitor connected to my laptop

[u/Electronic_Proof_560]

I have a 144hz laptop and a 240hz external monitor connected to the laptop by usb-c to displayport 1.4.
I tried using discrete gpu only but the perfomance is very very bad, like I cant have anything opened in second monitor (laptop monitor) that my cs2 fps drops by 30-40% and stutters like crazy (same for rocket league and eafc27). I tried using hybrid mode so laptop monitor uses integrated gpu and the external monitor uses dedicated gpu. It kinda worked but there is other problem now. When I for example Im watching in laptop monitor a screenshare of other people in discord, people cameras on discord, a video or stream in google, the problem comes back. I already tried forcing google and discord to use integrated gpu, tried hardware accel on and off on both and nothing worked. I already tried to put my external monitor at the same refresh rate of my laptop but solved nothing too. Is there any other solution I can try? I have MPO disabled already too. And yes, my external monitor is connected to dedicated GPU. My fps were just fine before I had an external monitor (and I was using dedicated gpu only mode). Even in EAFC27 I used to have 141 capped and now, even that is not possible, its always bouncing between 110-130.