Does 'transition: all' Slow Down CSS3 Transitions?

Does "Transition: All" Hinder CSS3 Transition Speed?

Using CSS3 transitions offers animated effects to web elements. A common practice is to employ "transition: all" to uniformly target all transitions for multiple elements. However, there is a debate regarding whether this approach compromises rendering performance.

Inquiry: Could targeting specific transition properties for each element (e.g., "transition: opacity .2s ease-in") result in faster and smoother animations compared to using "transition: all"?

Clarification: Does the CSS engine's search for "all" transition properties, even for elements with a single property, potentially slow down rendering?

Answer:

Yes, using "transition: all" can have significant performance drawbacks. The browser may perform unnecessary transition checks, even when certain properties remain unchanged or invisible to the user (e.g., color or dimension changes).

Demonstration:

This Dabblet demonstrates the issue: http://dabblet.com/gist/1657661. Changing the zoom level or font size triggers animations on all elements, regardless of whether a visible transition is necessary.

Recommendation:

To optimize performance, avoid using "transition: all" and opt for targeted transitions (e.g., "transition: margin .2s ease-in"). This limits unnecessary checks and reduces the risk of unwanted animations.

Additional Considerations:

"Transition: all" can also cause undesirable effects such as animation "splash" on page load, where initial styles are rendered before transition effects are applied. Targeted transitions help mitigate this issue.

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