Set your refresh in seconds to (words at a time / words per minute) * 60. And maybe add a check to make sure the show value is never smaller than the words at a

Set your refresh in seconds to (words at a time / words per minute) * 60. And maybe add a check to make sure the show value is never smaller than the words at a time value? (Though it is a fun, schizophrenic way to experience the start of 1984)