Oh the input lag. Do you have another monitor? Idk what causes it; no matter what resolution / windowed / fullscreened I get input lag on my laptop.
That is until I connected to another monitor, and chose one of “extend screen”, “duplicate screen”, or “second screen (external monitor) only” from display options, then the input lag went away. Even if the monitor was off, it would fix it, no idea why.
Please try even if you don’t have a monitor, see if you have a keyboard shortcut to change display settings.
edit: i just for my laptop, even when i don’t have an external monitory connected i can press “fn+f4” to get this to pop up: