Reading speed and comprehension

The ability to focus on the material, take it in, and retain it is the whole point of increasing reading speed, no matter who the reader might be. 
 

Some have argued that the process of pushing for greater reading speed lowers comprehension. This is both true and untrue, and the threshold for reading with good comprehension is different for different people and changes with the amount of reading practice.
 

Generally, reading at less than 100-200 words per minute is the normal rate for learning, and 200-400 words per minute are the normal rate for comprehension. Going beyond reading 500 words per minute can compromise the quality of reading and your comprehension.
 

There are ways to balance reading pace and comprehension. Effective speed reading techniques can help you read faster without compromising your comprehension. Some of the techniques include familiarization with reading material and minimizing subvocalization. 
 

References
How many words do we read per minute?
Oral Reading Frequency (ORF) norm - technical report