There is also a big "runs-on-my-machine" factor. Where the machine is the developers high-tier laptop hooked up to Gigabit LAN and Fiber WAN with <5ms ping and

There is also a big "runs-on-my-machine" factor. Where the machine is the developers high-tier laptop hooked up to Gigabit LAN and Fiber WAN with <5ms ping and >100Mbit symmetric. Luckely there are tools like Lighthouse[0] but with all the abstractions and frameworks inbetween it is often impossible to introduce the required changes without messing up the quality or complexity of the code/deployment. [0] https://developers.google.com/web/tools/lighthouse https://developers.google.com/web/tools/lighthouse