you're most likely just hovering the pen too far from the tablet which is a thing a lot of people have issues with during long jumps including me. If not, unless you better elaborate what you mean by lag i doubt anyone can help you
last time i'm answering anything in this thread, it's in the wrong subforum to begin with. enable tablet mode in osu!, update GPU drivers, re-install osu!, just play on the laptop
Okay, so here's what I want you to do, right click on the desktop and go to "Personalize", then after you do that, scroll down to the theme called "Windows Classic", and use that, that will disable ALL of Aero's features and you shouldn't get input lag after that.