Packages/com.unity.ugui/manual/comp-UIAutoLayout

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Packages/com.unity.ugui/manual/comp-UIAutoLayout

https://docs.unity3d.com/Packages/com.unity.ugui@latest/index.html?subfolder=/manual/comp-UIAutoLayout.html

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Comment by Jonathan Page:

From Unity UI Optimization tips :

Every UI element that marks its layout as dirty will perform, at minimum, one GetComponents call.
This call looks for a valid Layout Group on the Layout Element’s parent. If it finds one, it continues walking up the Transform hierarchy until it stops finding Layout Groups or reaches the hierarchy root–whichever comes first.
Therefore, each Layout Group adds one GetComponents call to each child Layout Element’s dirtying process, making nested Layout Groups extremely bad for performance.

Use them wisely and sparingly.