That is a perfectly normal speed to be reading period.
http://en.wikipedia.org/wiki/Words_per_minute
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The average adult reads prose text at 250 to 300 words per minute. While proofreading materials, people are able to read at 200 wpm on paper, and 180 wpm on a monitor.
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Audiobooks are recommended to be 150–160 words per minute, which is the range that people comfortably hear and vocalize words.
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Maybe your settings are throwing you off, thinking you're reading slower?