Firefox Quantum: BIG browser project, huh? I share your concern
Found on The Register on Tuesday, 28 March 2017

The major goal is to create a new rendering engine that's able to exploit the full power of today's hardware, which is a kind of marketing speak for "we're going to isolate every process and offload more rendering tasks to the GPU".
But since it seems there's just no way to stop the web-slowing world of crappy blogging tools, perhaps the browser can figure out a way around this by rethinking the rendering process.
There would be a simple method: let the browser give scores to the various parts of a website, and display the result along with the page. Back then when Google's PageRank was considered important, websites kept it in mind when doing changes. Today, browsers alert you of mixed content in HTTPS session. In the future, a browser could simply offer a little dropdown where every curious visitor can see why a page is slow. That puts the pressure on developers and plugin designers to produce good and efficient code again instead of just demanding more and more CPU to cope with their sloppy coding practices.