The reading speed of every people will not be same.
Some people can naturally read fast or slow.
Some people can remember the factors much better than others.
These things can not create a huge impact on speed-reading as long as you read and seeking for your desired information.
With the time reader learn how to faster the speed and memorize the important factors.
There is no alternative of concentration to improve speed-reading.
No matter what the technique readers follow without concentration he cannot achieve the ultimate understanding of the material.
That's why experts always emphasize on the 'pay attention' method.
Not all reader gives same level of attention in the reading.
It's a skill that grows over the period of time.
Relax mind is very much important for concentration.
When the brain is relax there is greater chance that reader can understand the theme much better.
Also reading time is also important for the concentration level.
Most of the expert suggests that early morning is the best time for concentration.
Some other suggests night is the best time.
It may vary with readers.
Reader must identify his own time and practice regularly on that time.
Good knowledge of vocabulary is essential in speed-reading process.
Many readers have a little idea about many words.
Most of the time they stuck in the middle of the reading and try to find out the meaning of those.
It causes lose of concentration and time.
People these days go through different kind of articles.
They exposed to diverse set of words.
speed-reading demands that reader must be knowledgeable of vocabulary.