Get an account on vocabulary.com (it's free). Sign in to vocabulary.com, click on "Lists" on the menu bar. Then click on the green button labeled, "Start a new list." Then copy up to 100 pages of text that you will be reading into the box for input. vocabulary.com will then give you a list of vocabulary words that it extracts from your reading text. Mark the box for each word you do not know and wish to learn. Then use vocabulary.com to study the meanings of these words. You will get a definition and a paragraph or so about how to use the study word. Now, you can read your text without having to stop and look up words so often.

I tried this with an article from The Atlantic Magazine and came up with a number of words that I was not totally sure about that I could study further. I am a native speaker, a college graduate, and someone who reads a lot.