I assume the web is slow today due to packing a couple megabytes of libraries, and adware / tracking malware, into each page load. More so than two millisecond

I assume the web is slow today due to packing a couple megabytes of libraries, and adware / tracking malware, into each page load. More so than two milliseconds of jank in how you constructed that SELECT pulldown. I don't believe that contemporary webdev's main problem is how we construct a SPA. I think it's the assumption that everything needs to be a SPA.