alt Hacker NewsNot paying attention.
1. Indiscriminate use of packages when a few lines of code would do.
2. Loading everything on every page.
3. Poor bundling strategy, if any.
4. No minification step.
5. Polyfilling for long dead, obsolete browsers
6. Having multiple libraries that accomplish the same thing
7. Using tools and then not doing any optimization at all (like using React and not enabling React Runtime)
Arguably things like an email client and file storage are apps and not pages so a SPA isn't unreasonable. The thing is, you don't end up with this much code by being diligent and following best practices. You get here by being lazy or uninformed.
What is React runtime? I looked it up and the closest thing I came across is the newly announced React compiler. I have a vested interest in this because currently working on a micro-SaaS that uses React heavily and still suffering bundle bloat even after performing all the usual optimizations.