To improve reading speed for pleasure novels, you need to get into the habit of reading regularly. The more you read, the faster you'll get. Try to read in chunks rather than word by word. For example, focus on groups of three or four words at a time. Additionally, make sure you're in a distraction - free environment so you can fully concentrate on the text.
One way is to practice skimming. Glance over the text quickly to get the general idea before reading in detail. Another tip is to limit subvocalization, that is, try not to say the words in your head while reading. Also, expand your vocabulary so you can recognize words more quickly.