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

js profile