- Mobile phones on the other hand are much more resource constrained: slower CPUs, less RAM and GPU memory, higher connection latencies, and so on. As a result, you should always try to profile and debug your site on mobile hardware to get a better and closer picture of how your users will experience your site on their handset.
https://developers.google.com/web/fundamentals/performance/critical-rendering-path/?hl=en
- is the sequence of steps that the browsers go through to convert the HTML, CSS, and JavaScript into actual pixels on the screen.
- if we can optimize this, then we can make our pages render fast, which makes for happier users.