Slow JS animations?

August 20, 2012 • by wes

Are you experiencing unexpectedly slow, weird, or inefficient animations? I was trying to get Javascript to animate something smoothly over 1000ms, but it just wasn’t working. It was jerky and slow. After pulling my hair out for a bit, I realized I had this defined in my CSS:

* {
  -webkit-transition:all 0.2s ease;
  -moz-transition:all 0.2s ease;
  -ms-transition:all 0.2s ease;
  -o-transition:all 0.2s ease;

…which equals instant conflict: JS was trying to do its thing, while the CSS animation was doing its own.

The solution was to remove the CSS  transitions on the target element, like so: {