Loading time vs content is one of those arguments that causes a catch 22 problem. You need exposure, sure, but you also need readers / viewers engaging in some kind of call to action. You eventually need to sell something.
Contrary to some belief, WordPress is somewhat bulky software. A large WordPress site isn't can be a resource hog. At the same time, internet speeds are getting faster and faster but then attention spans are shortening on the average. There are measures that can be taken to
optimize / compress images (text itself is too minimal to worry about, even a lot of it).
Icons that are responsive are actually fonts. They are either
loaded from a CDN or a file on your server, depending on what your developer decided to do.
Because of technologies like Bootstrap, Font Awesome, Glyphicons, jQuery, and the names you know which make up modern HTML5, most of that is already on the typical user's device and shouldn't cost any notable load time. To be sure, you can optimize for time by exclusively using a CDN for these technologies.
Another effective way to better your load time without compromising on content volume is to call the JS libraries and CSS at the bottom of your page. This way the content loads first, then styles and prepares for events later. It's not always possible to do this, but for most of the time you can get away with it.
Study the golden triangle. This was where Google searches were tested by heat map to see where eyes moved during a search query. They found that the eyes move to places where content is different at times. Let's see what I mean. Go to Google and search for "big data." Where did your eyes look? They looked at the first result, and the last result that you could see if you're like most people. If they didn't, it's because you're an IM and you're immune to these data points.
Now do another search for "avatar." Your eyes looked here:
So as you can see, the golden triangle is all about where are the eyes going? You can force eye movement with animations and color, usually. Animation is more effective because people have different color preferences, but color is hit or miss. The reason why I bring this up is because obviously advanced conversion applications like these are going to be just as important as "lots" of content. "Lots" of content gets you indexed, but good, conversion-centric content keeps them engaged.