Page speed improvements
One of the most important things in the maximum WP theme is a page speed by:
I would suggest improving it for PCs, mobiles and tablets
a. It is advised to make the code without unnecessary scripts and css styles as they may be placed in a separate files. So those files will be cached by users’ browsers and won’t be downloaded every time making page load slow
b. That is how the Guardian made the page speed faster. That information may be useful for your team
c. It is not advised to make a wide range of different thumbnails sizes as it takes server resources (for example in NewspaperTimes theme you have like 10 different types if thumbnails, it means that to upload an image it takes a while until each size will be generated (and most of the sizes will never be used)).
d. http://www.feedthebot.com/pagespeed/ — this tool is highly recommended to be used to improve a page speed