Feature request: flash words

[Thanatermesis]

Long time ago I used a fast reading app which had a feature I never seen again in other apps but it was the most useful one.

Basically it "removed" the words before to show the next one, this means that the words "flashes" (show word1, unshow it, show word2, unshow it...) instead of showing them linearly one after the other, this increases the visibility of the chars for the brain by really-knowing what chars are drawn, instead of retaining the previous pixels in your memory