Okay so i have gtx1050ti 4gb, Ram 8gb, I3 9100F. With this build this game warzone needs to work and still lags a lot. Idk what is the problem. Does this has to do something with my 75hz (1440x900) monitor?
Sure, as if the 1050ti is a 75hz@1440x900 card.
First step should be to reduce the graphics to 1080@60/medium and maybe even lower.
RAM will also help a lot but it will not turn the 1050ti into a good gaming GPU.
I have the same card in my system and I run the game at 720/medium,since the last patch it's actually running pretty ok.