Does 'transition: all' in CSS3 Slow Down Animations?

CSS3 Transitions: Does "transition: all" Affect Rendering Speed?

Question:

In CSS, using "transition: all" targets all transition properties for multiple elements, while specifying "transition: x" for each property separately targets specific properties. Does using "transition: all" hinder the speed and smoothness of animations compared to targeting specific properties?

Answer:

Yes, using "transition: all" can indeed negatively impact rendering performance. When "transition: all" is applied, the browser searches for all applicable transition properties, including those that may not be visible to the user, such as color and dimension changes.

This extra processing can slow down the animation, as the browser needs to not only calculate the transitions for the visible properties but also check for transitions that may not occur.

Example:

In the following example, using "transition: all" may cause unnecessary animations when changing the zoom level or font size:

/* With "transition: all" */
div, span, a {
  transition: all .2s ease-in;
}

/* With specific transitions */
div {
  transition: margin .2s ease-in;
}
span {
  transition: opacity .2s ease-in;
}
a {
  transition: background .2s ease-in;
}

Recommendation:

To optimize animation performance, it's generally recommended to avoid using "transition: all" and instead target specific transition properties. This not only improves rendering speed but also prevents unwanted splashes of animation during page load, where the initial and transition styles may appear sequentially.

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