I dived deeper and found the full results of the eWayBW test and a summary. So far I don’t see there why the test was considered a failure. It’s all in German of course.
When Google Reader was alive, I wanted to improve its UI, so I wrote a userscript which completely replaced everything in the browser but still spoke to the Reader's backend for data. When Reader was turned off, I only had to provide my own backend.
If you try frameworks interested in performance like Svelte or Astro or mostly anything beyond Angular and React, you’ll see very short build times and sub-second updates.
Not only in IDE, but on webpages as well