Does `translateZ(0)` Really Boost Performance, or Are There Hidden Stacking Context Costs?

Transforming Elements to 3D: Performance Implications

Discussions have emerged regarding the perceived performance benefits of using transform: translateZ(0), a technique that suggests tricking the GPU into perceiving elements as 3D to enhance animations and transitions. While this approach may indeed provide performance gains, it's essential to consider potential consequences.

Impacts of Global translateZ(0) Transformations

Applying translateZ(0) to all elements, as shown in the code snippet provided in the question, carries certain implications:

• Creation of Stacking Contexts: Transformations create new stacking contexts, causing fixed-position elements with transformations to behave like absolutely positioned elements.
• Z-Index Issues: Z-index values may become unpredictable within these new stacking contexts.

Consequences and Cautions

The implications of these changes manifest in ways that could be problematic. For instance, in the accompanying demo, the second div with a translateZ(0) transformation creates a separate stacking context, resulting in its pseudo-elements being layered above the first div instead of below.

Therefore, it's crucial to limit the use of 3D transformations to situations where performance optimizations are genuinely necessary. Another alternative for harnessing 3D acceleration without causing stacking context issues is -webkit-font-smoothing: antialiased;, which is exclusive to Safari.

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