There are many reasons why the poor readers cannot read much content in a normal time. They will spend a lot of time for reading small documents because of the reason the memory, sight and the main Is thinking power and visualisation. These are the reasons why they fail in reading.
The slower readers avoid reading the heavy contents and while the reading they move the eyes back and forward again and again this makes a lot of time and because of less memory they will try to read the words again and again and this also makes them to spend a lot of time. The reader who have eyesight also spends more time compared to those who can be better.
By elevuating all this one can achieve the speed reading by using pencil or finger to concentrate the eyes on a particular word this helps in reading faster.