I am presuming you do not have a learning disability. The easiest way to quicken your speed a little is to read books with easy writing and uncomplicated plots. After 10-15 of those, you will usually find that you read everything a bit faster. I find when I read a bunch of cozies, my reading for all things speeds up a bit.
If nearly all of what you read are dense, complicated plots, then you are probably already reading at the best speed for you.
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