Reading scientific and technical articles efficiently take a strategy -- and PRACTICE. Rarely does an engineer read an article from the first to the last word -- especially the first time they read the article.
Read through one or more of these reading guides to learn how professionals read highly technical and scientific articles:
How to read a scientific paper infographic from Elsevier
Ten simple rules for reading a scientific paper from PLOS Computational Biology
This research guide from the University of Portland has a lot of good sources of advice. We particularly like the quote “Nothing makes you feel stupid quite like reading a scientific journal article” from one of the sources here. Look around youtube for additional emotional and practical support.