https://developers.google.com/web/fundamentals/performance/critical-rendering-path/?hl=en
https://developers.google.com/web/tools/chrome-devtools/profile/memory-problems/memory-diagnosis
https://developer.chrome.com/devtools/docs/heap-profiling
https://addyosmani.com/blog/taming-the-unicorn-easing-javascript-memory-profiling-in-devtools/
https://classroom.udacity.com/courses/ud884/lessons/1464158641/concepts/14734291220923