This is suppositional, because I don’t read Braille regularly, so I’m exceedingly slow when I do read it.

Someone reading print visually, their eyes bounce about ALOT, looking ahead and looking back at words and even sentences. I don’t have specific studies to hand, but looking up eye tracking reading studies should give you the data. I know this was one of the things the psycholinguistics people were researching when I was in grad school (I never volunteered for any eye tracking studies, as I figured my nystagmus would throw off the results). Sighted people don’t read entirely linearly.

On the other hand, the only way to read Braille is one letter at a time. You have to read in a completely linear fashion. Yes a tactile reader can get good speeds, but based on the eye tracking data about how sighted people read, I surmise that a good tactile reader is never going to be as fast as a good sight reader, all other things being equal. The visual reader just has the ability to take in more information at once.

This is not meant as a value judgment against tactile reading or Braille.

(Note, auditory reading has the same issue. You can only hear one word at a time, so even if the voice is reading quickly, you are still limited in how much information you can access at once. The practical outcome of this is that I can’t skim read audio, so while I might be taking in individual words more quickly, I’m still slower because I have to read them all.)

In terms of reading Braille with their fingers, it is possible to read pretty fast (but it isn't common). But I've never encountered someone who could read Braille as fast as reading text

According to Swenson, faster Braille readers are able to hit 145wpm on average, while sighted readers are reading 265wpm. We tested in my Braille class today and our fastest reader was 133wpm.

With practice and the right equipment you can hit comparable speeds. In terms of writing you can technically go faster than writing just because of shortform and contractions.

The friends who read more than a couple of hundred words per minute in Braille have been able to do this using the two handed Braille reading method. They use multiple fingers on both hands, and they read with both hands, rather than tracking a line with the left finger and reading Braille with the right finger.