Flutterby™! : before the screen is finished rendering

Here’s how to avoid problems with straight-ticket voting in Texas:

But according to the Texas secretary of state’s office, the voting machines are not at fault. Rather, the problems reported are the result of “voters hitting a button or using the selection wheel before the screen is finished rendering,” which de-selects the pre-filled candidate selection.

"before the screen is finished rendering". What the fuck century are we living in that a screen of a couple of candidate choices is taking longer to render than a display refresh?