I agree. I don't do frontend stuff, but I sit next to the team that does. They take a lot of pride in making fast-loading pages that render quickly and respond instantly. That's not compatible with writing giant, bloated, inefficient code.
Maybe in your company. My experience browsing modern front-end SPA design however begs to differ. They pride themselves in loading megabytes of uncompressed images, layers of invisible background images, frameworks to load frameworks, auto-download/auto-playing 4k videos...
giving devs 4 year old laptops would help but when shiny startup is offering new macbooks how can you compete?
Just have them test under processing and bandwidth limits?