JS by itself isn't that bad. You could calculate pi digits reasonably fast using JS. The problem usually is: really poor code that is blocking, triggers a mill

JS by itself isn't that bad. You could calculate pi digits reasonably fast using JS. The problem usually is: really poor code that is blocking, triggers a million rerenders for every interaction, insane bloat, or just the absolute massive amount of abstractions through packages. Plus HTML + CSS is really slow.