My 2c...
According to the Powerscore book on RC, they say you should finish the passage in about 2 1/2 minutes (If I remember correctly) and make notations as you go along. This will allow you ample time to re-read to answer questions.
I've found that the skills taught to speed read has been incredibly helpful. Utilize these techniques, albeit slower than what was intended, to increase efficiency. I have found the idea's in this book pretty helpful... http://www.amazon.com/Triple-Your-Reading-Speed-4th/dp/0743475763/ref=sr_1_1?s=books&ie=UTF8&qid=1401559311&sr=1-1&keywords=how+to+triple+your+reading+speed
I don't want to ramble on, so if you have any specific questions I'll more than happy to share my thoughts on why I think this has helped.
there is a book that can tell you how to triple your reading speed... not sure what its called... maybe this