CSS Transitions: Is 'transition: all' or 'transition: x' Faster?

CSS3 Transitions: Performance Impact of "transition: all" vs. "transition: x"

Regarding the performance efficiency of CSS3 transitions, a common question arises: Is it faster to use "transition: all" or "transition: x" for specific properties?

To answer this, consider the following CSS snippet:

div, span, a {
  transition: all;
}

While using "transition: all" provides a convenient way to target all transitions for multiple elements, it may hinder performance. Browsers must scan all CSS properties for possible transitions, even if only a few require animation.

For example, the following declaration is more efficient by targeting specific properties:

div {
  transition: margin .2s ease-in;
}
span {
  transition: opacity .2s ease-in;
}
a {
  transition: background .2s ease-in;
}

In this scenario, the browser will only check the necessary transitions rather than scanning for all properties.

Furthermore, using "transition: all" can lead to unintended animations. For instance, consider the following CSS:

div {
  transition: all;
  background: red;
}

div:hover {
  background: blue;
}

When hovering over the div element, not only the background color will transition, but any other CSS properties that have been set, such as positioning or font size. This can cause unwanted visual effects.

In conclusion, while the convenience of "transition: all" may be appealing, it is generally recommended to use specific "transition: x" declarations for optimal performance and to avoid potential animation inconsistencies. By targeting only the necessary properties, browsers can render animations more efficiently.

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