Mouse lagging on Ubuntu 17.10
"Gnome/Wayland has mouse tracking issues (see https://bugzilla.gnome.org/show_bug.cgi?id=745032)."
Ubuntu 17.10 uses wayland by default. however, you can switch back to Xorg, without to install anything, all you need to do is:
Log out from you current user.
Under the password, near the "unlock" button, you will have something like a settings-icon.
Click it, and choose the second option(the one says "xorg")
And there you have it! the good old xorg session, with no more cursor lags!
"Switching to an Xorg session from the log in screen should solve it."