It's pretty reactive, as the screen only refreshes the chars that have changed on the matrix at each key stroke. Even a page up/down that changes all the screen

It's pretty reactive, as the screen only refreshes the chars that have changed on the matrix at each key stroke. Even a page up/down that changes all the screen is very fast. I only do full refresh with flashing when using the menu so some ghosting may appear, but I haven't experienced it.