Here's what Cecilia Tubaiana say:
"I first get a general idea by reading the abstract and conclusions. The conclusions help me understand if the goal summarized in the abstract has been reached, and if the described work can be of interest for my own study. I also always look at plots/figures, as they help me get a first impression of a paper. Then I usually read the entire article from beginning to end, going through the sections in the order they appear so that I can follow the flow of work that the authors want to communicate.
If you want to make it a productive exercise, you need to have a clear idea of which kind of information you need to get in the first place, and then focus on that aspect. It could be to compare your results with the ones presented by the authors, put your own analysis into context, or extend it using the newly published data.
Citation lists can help you decide why the paper may be most relevant to you by giving you a first impression of how colleagues that do similar research as you do may have used the paper."