It's especially bad with the CSS frameworks that people slap on their sites.
Various Material UI implementations are notorious here because they have fancy animations everywhere.
Various Material UI implementations are notorious here because they have fancy animations everywhere.
I've seen so many jquery libraries used on sites to get a quick fancy animation, but then it used something like: setTimeout(() => { element.height += 2; }, 50)
Which literally brings a 60+fps page to <5fps on a high-end machine.