js profiler

 

https://developers.google.com/web/fundamentals/performance/critical-rendering-path/?hl=en

 

https://developers.google.com/web/tools/chrome-devtools/profile/rendering-tools/analyze-runtime?hl=en

 

https://developers.google.com/web/fundamentals/performance/rendering/stick-to-compositor-only-properties-and-manage-layer-count

 

https://developers.google.com/web/tools/chrome-devtools/profile/network-performance/resource-loading?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