I recently started a course on "Speed Reading", which aim is to read faster whilst holding the level of comprehension constant (so not to its detriment, but not aimed at improving comprehension either).
Now, for the case of reading, I imagine we can define a rate at which information is been given to the brain. So, the faster you read (holding comprehension constant), the higher such rate is. Clearly, the aim of such training programs like "speed reading" is to move that rate up.
Is there an upper limit to such rate, perhaps because of biological reasons? Does it depends on the person? Can we say, for example, that it is biologically impossible to comprehend a text reading faster than 1,000 words per minute? Is there any evidence of such limit? This information would be useful to understand the scope of improvement possible on this issue.