Tell them to stop taking speed.
Lol
I tend to use a program mainly zap it with two words flashing on the screen at about 500wpm with a total combined speed of 1000wpm, on a hard-copy it is much faster though about 1200 words a minute and with skimming/scanning this can be double. But anything with %s and numbers dates an unique words can really slow you down. I have about 65% comprehension when I do this, though if I read at about 200wpm with a combined 400wpm then I have about 90% comprehension. I am a dyslexic believe it or not, I can't spell but I can read better then most folks, I suck at math and numbers though hate numbers can me really confusing.
I read in my mind, if you get what that means, I don't sound the words out, they are just flashed in my mind like objects and colors. This is why my spelling is so bad, I know the color of the word in my mind but I can't figure out how it's spelled lol.
Basically it looks something like this:
But all words with unique shapes and colors.