The UI and UI Details Profiler modules provide information on how much time and resources Unity spends laying out and rendering the user interface within your application. You can use this module to understand how Unity handles UI batching for your application, including why and how it batches objects. You can also use this module to find out which part of the UI has slow performance, or to preview the UI while you scrub the timeline.


The UI and UI Details Profiler modules' charts contain the following categories. To change the order of the categories in the chart, you can drag and drop them in the chart's legend. You can also click a category's colored legend to toggle its display.

|**Layout**|How much time Unity spent performing the layout pass for the UI. This includes calculations done by [`HorizontalLayoutGroup`](https://docs.unity3d.com/Packages/com.unity.ugui@latest/index.html?subfolder=/api/UnityEngine.UI.HorizontalLayoutGroup.html), [`VerticalLayoutGroup`](https://docs.unity3d.com/Packages/com.unity.ugui@latest/index.html?subfolder=/api/UnityEngine.UI.VerticalLayoutGroup.html), and [`GridLayoutGroup`](https://docs.unity3d.com/Packages/com.unity.ugui@latest/index.html?subfolder=/api/UnityEngine.UI.GridLayoutGroup.html).|

|**Render**|How much time the UI has spent doing its portion of rendering. This is either the time spent rendering directly to the graphics device or rendering to the main render queue.|

When you select the UI or the UI Details Profiler module, the module details pane at the bottom of the Profiler window displays more details on the UI in your application. You can use it to inspect the profiling information about the UI objects in your application. The pane is divided into the following columns:

|**Self Batch Count**|How many batches Unity generated for the canvas.|

|**Cumulative Batch Count**|How many batches Unity generated for the canvas and all its nested canvases.|

|**Batch Breaking Reason**|Why Unity split the batch. Sometimes Unity might not be able to batch objects together. Common reasons include: <ul><li>**Not Coplanar With Canvas**: The batching needs the object's rect transform to be coplanar (unrotated) with the canvas. </li><li>**CanvasInjectionIndex**: A CanvasGroup component is present and forces a new batch, such as when it displays the drop down list of a combo box on top of the rest.</li><li>**Different Material Instance, Rect clipping, Texture, or A8TextureUsage**: Unity can only batch together objects with identical materials, masking, textures, and texture alpha channel usage.</li></ul>|

When you select a UI object from the list, a preview of it appears on the right hand side of the pane. Above the preview there are the following options in the toolbar:

|[`<sprite>`](RichTextSprite.md)|Adds a [sprite](Srites.md) to the text.|By default, TextMesh Pro looks in the default sprite assets, but you can use tag attributes to retrieve sprites from other assets.|

The Rect Transform has a concept of **driven properties** to address this. For example, a Content Size Fitter which has the Horizontal Fit property set to Minimum or Preferred will drive the width of the Rect Transform on the same Game Object. The width will appear as read-only and a small info box at the top of the Rect Transform will inform that one or more properties are driven by Conten Size Fitter.

| [UI and UI Details Profiler](ProfilerUI.md) | Use the UI and UI Details Profiler modules to understand how Unity handles UI batching for your application. |