"As of writing in 2018, the average website requires downloading around 3MB and making over 100 individual HTTP requests. Browsh will turn this into around 15kb and 2 HTTP requests - 1 for the HTML/text and the other for the favicon."
Does "100 individual HTTP requests" mean 100 TCP connections?
As far as I know, according to RFC 2616, connection keep-alive was intended to promote making numerous HTTP requests. In fact, IME, most web servers default to setting max-requests at 100. Some are higher.
Following the guidance of the RFCs, for decades I have been using this HTTP feature to make 100 requests to a site in a single connection. That is 100 pages of HTML in one quick TCP connection. If I retrieve 3MB, it is 3MB of HTML from the website and zero from third parties. (Further, I have written filters to remove junk from the HTML and print only the content I want, e.g. for reading or to import into database. If I need to split into separate files, which is rare, csplit works nicely.)
In order to achieve this efficiency I could not and do not use a popular browser authored by ad-supported entities. I am an avid text-based web user who has no need for ads, graphics, and other external resources, e.g. Javascript. As such, I can use clients that can support http pipelining according to the RFCs. It works very well; no complaints.
Best of luck with this project.